JCheckBox,我的构造函数有问题。
JCheckBox, something wrong with my constructor.
中间的"public Dorm()"区域报错。在声明构造函数之前我是否遗漏了什么?我不明白这是一个非法的表达式开始。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Dorm extends JFrame implements ItemListener {
public static void main(String[] args){
FlowLayout flow = new FlowLayout();
JLabel label = new JLabel("Please select items you would like for your dorm room: ");
JCheckBox Internet = new JCheckBox("Internet", false);
JCheckBox Cable = new JCheckBox("\nCable", false);
JCheckBox Microwave = new JCheckBox("\nMicrowave", false);
JCheckBox Refridgerator = new JCheckBox("\nRefridgerator", false);
public Dorm(){
super("Dorm Selections");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
Internet.addItemListener(this);
Cable.addItemListener(this);
Microwave.addItemListener(this);
Refridgerator.addItemListener(this);
add(labale);
add(Internet);
add(Cable);
add(Microwave);
add(Retriderator);
}
}
}
Dorm.java:22: error: illegal start of expression
public Dorm(){
^
Dorm.java:22: error: ';' expected
public Dorm(){
^
2 errors
您的构造函数在 main 方法中。
将构造函数移动到 class 级别。
你应该将构造函数放在 method.like 之外 this.and 在 main 方法中创建新对象。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Dorm extends JFrame implements ItemListener {
public Dorm(){
super("Dorm Selections");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
FlowLayout flow = new FlowLayout();
JLabel label = new JLabel("Please select items you would like for your dorm room: ");
JCheckBox Internet = new JCheckBox("Internet", false);
JCheckBox Cable = new JCheckBox("\nCable", false);
JCheckBox Microwave = new JCheckBox("\nMicrowave", false);
JCheckBox Refridgerator = new JCheckBox("\nRefridgerator", false);
Internet.addItemListener(this);
Cable.addItemListener(this);
Microwave.addItemListener(this);
Refridgerator.addItemListener(this);
add(labale);
add(Internet);
add(Cable);
add(Microwave);
add(Retriderator);
}
public static void main(String[] args){
new Dorm();
}
}
中间的"public Dorm()"区域报错。在声明构造函数之前我是否遗漏了什么?我不明白这是一个非法的表达式开始。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Dorm extends JFrame implements ItemListener {
public static void main(String[] args){
FlowLayout flow = new FlowLayout();
JLabel label = new JLabel("Please select items you would like for your dorm room: ");
JCheckBox Internet = new JCheckBox("Internet", false);
JCheckBox Cable = new JCheckBox("\nCable", false);
JCheckBox Microwave = new JCheckBox("\nMicrowave", false);
JCheckBox Refridgerator = new JCheckBox("\nRefridgerator", false);
public Dorm(){
super("Dorm Selections");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
Internet.addItemListener(this);
Cable.addItemListener(this);
Microwave.addItemListener(this);
Refridgerator.addItemListener(this);
add(labale);
add(Internet);
add(Cable);
add(Microwave);
add(Retriderator);
}
}
}
Dorm.java:22: error: illegal start of expression
public Dorm(){
^
Dorm.java:22: error: ';' expected
public Dorm(){
^
2 errors
您的构造函数在 main 方法中。 将构造函数移动到 class 级别。
你应该将构造函数放在 method.like 之外 this.and 在 main 方法中创建新对象。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Dorm extends JFrame implements ItemListener {
public Dorm(){
super("Dorm Selections");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
FlowLayout flow = new FlowLayout();
JLabel label = new JLabel("Please select items you would like for your dorm room: ");
JCheckBox Internet = new JCheckBox("Internet", false);
JCheckBox Cable = new JCheckBox("\nCable", false);
JCheckBox Microwave = new JCheckBox("\nMicrowave", false);
JCheckBox Refridgerator = new JCheckBox("\nRefridgerator", false);
Internet.addItemListener(this);
Cable.addItemListener(this);
Microwave.addItemListener(this);
Refridgerator.addItemListener(this);
add(labale);
add(Internet);
add(Cable);
add(Microwave);
add(Retriderator);
}
public static void main(String[] args){
new Dorm();
}
}