使用 DefaultTableModel 根据特定值为 JTable 的特定单元格着色

Question

如何使用 defaulttablemodel 概念为特定单元格数据或单元格着色？该数组由字符串值组成。所以如果我们在最后一行有“1”，单元格应该变成红色，如果是“0”，那么单元格应该变成绿色。这可能吗？我正在使用 eclipse IDE

如果可能的话，哪些改动对代码有好处？

package mywork;

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JLabel;
import java.awt.Font;

import java.awt.Color;


import javax.swing.JPanel;
import javax.swing.JTextField;

import javax.swing.JButton;

import java.util.ArrayList;

import javax.swing.SwingConstants;

import javax.swing.table.DefaultTableModel;

import javax.swing.JTable;
import javax.swing.JScrollPane;

import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.ImageIcon;

import javax.swing.LayoutStyle.ComponentPlacement;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.Rectangle;
import java.awt.Dimension;


public class lru extends JFrame {

    /**
     * 
     */
    private static final long serialVersionUID = 8974257654196993862L;
    
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    lru window = new lru();
                    window.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     
     */
    
    public lru() {

        setMinimumSize(new Dimension(1080, 1080));
        
        JPanel panel = new JPanel();
        panel.setBackground(new Color(19, 40, 60));
        panel.setAlignmentY(0.0f);
        panel.setAlignmentX(0.0f);
        
        JLabel label = new JLabel();
        label.setIcon(new ImageIcon(lru.class.getResource("/images/simulator.png")));
        label.setHorizontalAlignment(SwingConstants.CENTER);
        
        JLabel label_1 = new JLabel();
        label_1.setIcon(new ImageIcon(lru.class.getResource("/images/algorithm.png")));
        label_1.setHorizontalAlignment(SwingConstants.CENTER);
        
        JLabel label_2 = new JLabel();
        label_2.setIcon(new ImageIcon(lru.class.getResource("/images/home.png")));
        label_2.setHorizontalAlignment(SwingConstants.CENTER);
        
        JPanel panel_1 = new JPanel();
        panel_1.setBorder(null);
        
        JScrollPane scrollPane_1 = new JScrollPane();
        scrollPane_1.setFont(new Font("Century Schoolbook", Font.BOLD, 20));
        scrollPane_1.setBounds(new Rectangle(500, 400, 150, 200));
        scrollPane_1.setBorder(null);
        
        JLabel lblNewLabel_7 = new JLabel("\"1\" \r\n Page fault");
        lblNewLabel_7.setFocusable(false);
        lblNewLabel_7.setFocusTraversalKeysEnabled(false);
        lblNewLabel_7.setInheritsPopupMenu(false);
        lblNewLabel_7.setRequestFocusEnabled(false);
        lblNewLabel_7.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel_7.setFont(new Font("Century Schoolbook", Font.BOLD, 20));
        
        JLabel lblPageHit = new JLabel("\"0\" \r\n Page Hit");
        lblPageHit.setVerifyInputWhenFocusTarget(false);
        lblPageHit.setFocusable(false);
        lblPageHit.setFocusTraversalKeysEnabled(false);
        lblPageHit.setInheritsPopupMenu(false);
        lblPageHit.setHorizontalAlignment(SwingConstants.CENTER);
        lblPageHit.setFont(new Font("Century Schoolbook", Font.BOLD, 20));
        GroupLayout groupLayout = new GroupLayout(getContentPane());
        groupLayout.setHorizontalGroup(
            groupLayout.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout.createSequentialGroup()
                    .addComponent(panel, GroupLayout.PREFERRED_SIZE, 96, GroupLayout.PREFERRED_SIZE)
                    .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                        .addGroup(groupLayout.createSequentialGroup()
                            .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                                .addGroup(groupLayout.createSequentialGroup()
                                    .addPreferredGap(ComponentPlacement.RELATED)
                                    .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, 932, GroupLayout.PREFERRED_SIZE))
                                .addGroup(groupLayout.createSequentialGroup()
                                    .addGap(55)
                                    .addComponent(scrollPane_1, GroupLayout.PREFERRED_SIZE, 854, GroupLayout.PREFERRED_SIZE)))
                            .addContainerGap(32, Short.MAX_VALUE))
                        .addGroup(groupLayout.createSequentialGroup()
                            .addGap(111)
                            .addComponent(lblNewLabel_7, GroupLayout.PREFERRED_SIZE, 155, GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(ComponentPlacement.RELATED, 389, Short.MAX_VALUE)
                            .addComponent(lblPageHit, GroupLayout.PREFERRED_SIZE, 155, GroupLayout.PREFERRED_SIZE)
                            .addGap(160))))
        );
        groupLayout.setVerticalGroup(
            groupLayout.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout.createSequentialGroup()
                    .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                        .addComponent(panel, GroupLayout.PREFERRED_SIZE, 845, GroupLayout.PREFERRED_SIZE)
                        .addGroup(groupLayout.createSequentialGroup()
                            .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, 423, GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(ComponentPlacement.UNRELATED)
                            .addComponent(scrollPane_1, GroupLayout.PREFERRED_SIZE, 256, GroupLayout.PREFERRED_SIZE)
                            .addGap(18)
                            .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                                .addComponent(lblPageHit, GroupLayout.PREFERRED_SIZE, 25, GroupLayout.PREFERRED_SIZE)
                                .addComponent(lblNewLabel_7))))
                    .addContainerGap(198, Short.MAX_VALUE))
        );
        
        JLabel lblNewLabel = new JLabel("Least Recently Used");
        lblNewLabel.setFont(new Font("Century Schoolbook", Font.BOLD, 36));
        
        JLabel lblNewLabel_1 = new JLabel("No.of Frame:");
        lblNewLabel_1.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        JLabel lblNewLabel_2 = new JLabel("Input Page No.:");
        lblNewLabel_2.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        JLabel lblNewLabel_3 = new JLabel("Total Page Fault:");
        lblNewLabel_3.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        textField = new JTextField();
        textField.setFont(new Font("Century Schoolbook", Font.PLAIN, 20));
        textField.setColumns(10);
        
        textField_1 = new JTextField();
        textField_1.setFont(new Font("Century Schoolbook", Font.PLAIN, 20));
        textField_1.setColumns(10);
        
        JLabel lblNewLabel_4 = new JLabel("0");
        lblNewLabel_4.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        
        
        JLabel lblNewLabel_5 = new JLabel("Hit Rate:");
        lblNewLabel_5.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        JLabel lblNewLabel_6 = new JLabel("0%");
        lblNewLabel_6.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        
        JButton btnNewButton = new JButton("Implement");
        btnNewButton.addMouseListener(new MouseAdapter() {
            

            @Override
            public void mouseClicked(MouseEvent e) {
                capacity = Integer.parseInt(textField.getText());
                n = capacity + 1;
                //System.out.println(capacity);
                String getInput = textField_1.getText();
                int i=0,ct=0;
                float hr1;
                String hr ="";
                String tempstr="";
                ArrayList<Integer> arrl = new ArrayList<>();
                while(i<getInput.length()) {
                    if(!Character.isWhitespace(getInput.charAt(i))) {
                        tempstr+=getInput.charAt(i);
                    }   
                    else {
                        arrl.add(ct, Integer.parseInt(tempstr));
                        ct++;
                        tempstr = "";
                    }
                    if(i == getInput.length()-1)
                        arrl.add(ct, Integer.parseInt(tempstr));
                    i++;
                }
                //System.out.println(arrl);
                len = arrl.size();
                System.out.println(len);
                array = new int[len];
                for(i=0;i<len;i++) {
                    array[i]=arrl.get(i);
                }
                int[][] process = new int[n][len];
                ArrayList<Integer> temp= new ArrayList<>();
                ct = 0;
                
                for(i=0;i<len;i++) {
                    if(!temp.contains(array[i])) {
                        if(temp.size()== capacity ) {
                            temp.remove(0);
                            temp.add(capacity-1, array[i]);
                        }
                        else {
                            temp.add(ct, array[i]);
                        }
                        page_fault = true;
                        ct++;
                    }
                    else {
                        temp.remove((Object)array[i]);
                        temp.add(temp.size(), array[i]);
                        page_fault = false;
                    }
                    for(int j=0;j<n;j++) {
                        if(temp.size()<n) {
                            if(j==temp.size())
                                break;
                        }
                        process[j][i] = temp.get(j);
                        if(page_fault == true)
                        {
                            process[n-1][i] = 1;
                        }
                        else
                        {
                            process[n-1][i] = 0;
                        }
                    }
                }
                 hr1 = (float)ct/len;
                 hr1 = 1 - hr1;
                 System.out.println(ct);
                 System.out.println(hr1);
                 hr1 = hr1*100;
                 hr = Float.toString(hr1);
                 hr = hr+"%";
                lblNewLabel_4.setText(String.valueOf(ct));
                lblNewLabel_6.setText(hr);
                String[][] processstr = new String[n][len];
                String[] arraystr = new String[len];
                for(int j=0;j<n;j++) {
                    for(i=0;i<len;i++) {
                        processstr[j][i] = String.valueOf(process[j][i]);
                    }
                }
                for(i=0;i<len;i++) {
                    arraystr[i] = String.valueOf(array[i]);
                }
               for(i=0;i<len;i++)
               {
                   if(processstr[n-1][len] != "0") {
                       
                   }
               }
                
            
                
                DefaultTableModel dtm = new DefaultTableModel(processstr, arraystr);
                 table_1 = new JTable(dtm);
                
                
                table_1.setFont(new Font("Century Schoolbook", Font.BOLD, 20));
               
                int width = 50*len;
                int height = 50*capacity;
                table_1.setRowHeight(50-(25/capacity));
                
                scrollPane_1.setBounds(500, 400, width, height);
                //table_1.setBounds(50, 397, width, height);
                scrollPane_1.setViewportView(table_1);
                
            }
            
        });
        btnNewButton.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        JButton btnNewButton_1 = new JButton("Reset");
        btnNewButton_1.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                textField.setText("0");
                textField_1.setText("0");
                lblNewLabel_4.setText("0");
                lblNewLabel_6.setText("0%");
                table_1.setVisible(false);
                table_1.setTableHeader(null);
                
            }
        });
        btnNewButton_1.setFont(new Font("Century Schoolbook", Font.BOLD, 30));
        
        GroupLayout gl_panel_1 = new GroupLayout(panel_1);
        gl_panel_1.setHorizontalGroup(
            gl_panel_1.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_panel_1.createSequentialGroup()
                    .addGap(346)
                    .addComponent(lblNewLabel, GroupLayout.DEFAULT_SIZE, 391, Short.MAX_VALUE)
                    .addGap(204))
                .addGroup(gl_panel_1.createSequentialGroup()
                    .addGap(281)
                    .addComponent(lblNewLabel_1, GroupLayout.DEFAULT_SIZE, 218, Short.MAX_VALUE)
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addComponent(textField, GroupLayout.DEFAULT_SIZE, 158, Short.MAX_VALUE)
                    .addGap(280))
                .addGroup(gl_panel_1.createSequentialGroup()
                    .addGap(242)
                    .addComponent(lblNewLabel_2, GroupLayout.DEFAULT_SIZE, 250, Short.MAX_VALUE)
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addComponent(textField_1, GroupLayout.DEFAULT_SIZE, 363, Short.MAX_VALUE)
                    .addGap(82))
                .addGroup(gl_panel_1.createSequentialGroup()
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.TRAILING)
                        .addGroup(gl_panel_1.createSequentialGroup()
                            .addContainerGap()
                            .addComponent(lblNewLabel_3)
                            .addGap(43))
                        .addGroup(gl_panel_1.createSequentialGroup()
                            .addGroup(gl_panel_1.createParallelGroup(Alignment.TRAILING)
                                .addGroup(gl_panel_1.createSequentialGroup()
                                    .addContainerGap()
                                    .addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 251, GroupLayout.PREFERRED_SIZE))
                                .addGroup(gl_panel_1.createSequentialGroup()
                                    .addGap(217)
                                    .addComponent(lblNewLabel_5, GroupLayout.PREFERRED_SIZE, 168, GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(ComponentPlacement.RELATED, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .addComponent(lblNewLabel_6, GroupLayout.PREFERRED_SIZE, 124, GroupLayout.PREFERRED_SIZE)))
                            .addPreferredGap(ComponentPlacement.RELATED)))
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.LEADING)
                        .addGroup(gl_panel_1.createSequentialGroup()
                            .addComponent(lblNewLabel_4, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addGap(402))
                        .addGroup(gl_panel_1.createSequentialGroup()
                            .addGap(11)
                            .addComponent(btnNewButton_1, GroupLayout.PREFERRED_SIZE, 182, GroupLayout.PREFERRED_SIZE)
                            .addContainerGap())))
        );
        gl_panel_1.setVerticalGroup(
            gl_panel_1.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_panel_1.createSequentialGroup()
                    .addGap(33)
                    .addComponent(lblNewLabel)
                    .addGap(51)
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.TRAILING)
                        .addComponent(lblNewLabel_1)
                        .addComponent(textField, GroupLayout.PREFERRED_SIZE, 28, GroupLayout.PREFERRED_SIZE))
                    .addGap(8)
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.BASELINE)
                        .addComponent(lblNewLabel_2)
                        .addComponent(textField_1, GroupLayout.PREFERRED_SIZE, 31, GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(ComponentPlacement.RELATED, 41, Short.MAX_VALUE)
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.BASELINE)
                        .addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 51, GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnNewButton_1, GroupLayout.PREFERRED_SIZE, 54, GroupLayout.PREFERRED_SIZE))
                    .addGap(18)
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.BASELINE)
                        .addComponent(lblNewLabel_3)
                        .addComponent(lblNewLabel_4))
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addGroup(gl_panel_1.createParallelGroup(Alignment.BASELINE)
                        .addComponent(lblNewLabel_5)
                        .addComponent(lblNewLabel_6))
                    .addGap(22))
        );
        panel_1.setLayout(gl_panel_1);
        GroupLayout groupLayout_1 = new GroupLayout(panel);
        groupLayout_1.setHorizontalGroup(
            groupLayout_1.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout_1.createSequentialGroup()
                    .addGap(10)
                    .addGroup(groupLayout_1.createParallelGroup(Alignment.LEADING)
                        .addComponent(label_2, GroupLayout.PREFERRED_SIZE, 74, GroupLayout.PREFERRED_SIZE)
                        .addComponent(label_1, GroupLayout.PREFERRED_SIZE, 74, GroupLayout.PREFERRED_SIZE)
                        .addComponent(label, GroupLayout.PREFERRED_SIZE, 74, GroupLayout.PREFERRED_SIZE)))
        );
        groupLayout_1.setVerticalGroup(
            groupLayout_1.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout_1.createSequentialGroup()
                    .addGap(106)
                    .addComponent(label_2, GroupLayout.PREFERRED_SIZE, 61, GroupLayout.PREFERRED_SIZE)
                    .addGap(34)
                    .addComponent(label_1, GroupLayout.PREFERRED_SIZE, 73, GroupLayout.PREFERRED_SIZE)
                    .addGap(36)
                    .addComponent(label, GroupLayout.PREFERRED_SIZE, 81, GroupLayout.PREFERRED_SIZE))
        );
        panel.setLayout(groupLayout_1);
        getContentPane().setLayout(groupLayout);
        
    }


    /**
     * Initialize the contents of the frame.
     */
    int capacity;
    int len=0;
    int n=0;
    int[] array;
    boolean page_fault = false;
    int[][] process;
    private JTextField textField;
    private JTextField textField_1;
    private JTable table_1;
}

Answer 1

要根据值对 JTable 中的特定单元格进行着色，您可以覆盖 JTable 的 prepareRender()。

样本：

public static void main(String[] args) {
    JFrame frame = new JFrame();

    String[] header = { "Content1", "Content2", "Content3" };
    Object[][] data = { { 1, 0, 1 }, { 0, 0, 1 } };
    JTable table = new JTable(data, header) {
        @Override
        public Component prepareRenderer(TableCellRenderer renderer, int row, int col) {
            Component comp = super.prepareRenderer(renderer, row, col);
            int cellValue = (int) getModel().getValueAt(row, col); // get the value from the cell
            switch (cellValue) { // color the cell accordingly
            case 1:
                comp.setBackground(Color.red);
                break;
            case 0:
                comp.setBackground(Color.green);
                break;
            }
            return comp;
        }
    };

    frame.add(table);
    frame.pack();
    frame.setVisible(true);
}

结果：

使用 DefaultTableModel 根据特定值为 JTable 的特定单元格着色

Use DefaultTableModel to color specific cell of the JTable based on their specific value

java

eclipse

swing

jtable

swingbuilder