按升序对数组进行排序

Question

所以我现在有这段代码。它运行，但它不会按升序对数字数组进行排序，我不知道我应该怎么做。我是 java 的新手，所以...

import javax.swing.JOptionPane;

public class ThirdClass
{
    public static void main (String args[]){

        int a = 0;
        int b;

        int numbers;
        int length = Integer.parseInt(JOptionPane.showInputDialog (null, "Input set size", JOptionPane.QUESTION_MESSAGE));
        int ctr = 1;
        int num[] = new int[length];

            for(int i = 0; i < length; i++){
            num[i] = Integer.parseInt(JOptionPane.showInputDialog (null, "Enter number " + ctr, JOptionPane.QUESTION_MESSAGE));
                    ctr++;
            }

            for(int i = 0; i < length; i++){
                for(int j = i+1; j < length; j++){
                        if(num[i]<num[j]){
                            a = num[i];
                            num[i] = num[j];
                            num[j] = a;
                        }
                    }
            }

            for(int i = 0; i < length; i++){
            JOptionPane.showMessageDialog (null, "Output: " + num[i] , "Value", JOptionPane.INFORMATION_MESSAGE);
            }
    }
}

Answer 1

您似乎在尝试进行冒泡排序，但您的逻辑有点不对劲。将双 for 循环更改为：

for (int i=0; i < length; ++i) {
    for (int j=1; j < (length-i); ++j) {
        if (num[j-1] > num[j]){
            a = num[j-1];
            num[j-1] = num[j];
            num[j] = a;
        }
    }
}

Answer 2

您不需要更改完整的逻辑。只需要把小于号改成大于号检查下面的代码。

for(int i = 0; i < length; i++){
                for(int j = i+1; j < length; j++){
                        if(num[i]>num[j]){
                            a = num[i];
                            num[i] = num[j];
                            num[j] = a;
                        }
                    }
            }

按升序对数组进行排序

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