The for loop summarizes the article every day, which is very fulfilling

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public class homework02 {
    
    
    public static void main(String[] args) {
    
    
        for (int i = 10; i > 0; i--) {
    
    
            System.out.println("i = " + i);
        }
        System.out.println("-------------分割线---------------");
        for (int i = 10; i > 0; i -= 2) {
    
    
            System.out.println("i = " + i);
        }
        System.out.println("-------------分割线---------------");
        for (int i = 100; i >= 10; i /= 3) {
    
    
            System.out.println("i = " + i);
        }

    }
}

Code idea:

i=10, i>0, the output result i=10, the program execution ends, i=i–=9; i=9, i>0, the output result i=9, the program execution ends, i=i–= 8; i=8, i>0, the output result i=8, the program execution ends, i=i–=7; and so on.

for loop nesting

public class homework04 {
    
    
    public static void main(String[] args){
    
    
        //循环5次
        for(int i = 1;i <= 5; i++){
    
    
            System.out.print("i = " + i + ",");
        }
        System.out.println();
//循环2次
         for(int j=1;j<=2;j++){
    
    
             System.out.print("j="+j+",");
         }
         System.out.println();
        //把i循环放在j循环体当中,先内部循环5次，在外部循环2次
         for(int j = 1;j <= 2;j++){
    
    
             for(int i = 1;i <= 5;i++){
    
    
                 System.out.print("i="+i+",");
             }
         }
    }