A simple code example of a Java looping exercise

public class TestDemo {
     public static void main(String[] args){
         for(int b=1;b<10;b++){
             for(int a=1;a<=b;a++)
                 System.out.print(a+"*"+b+"="+a*b+"t");
             System.out.println();
         }
     }

 }
 

public class Test {
     public static void main(String[] args){
         printTriangle_1(5);
         System.out.println("--------------");
         printTriangle_2(5);
         System.out.println("--------------");
         printTriangle_3(5);
         System.out.println("--------------");
         printTriangle_4(5);

     }

     public static void printTriangle_1(int n){
         for(int i=1;i<=n;i++){
             for(int j=1;j<=i;j++){
                 System.out.print("*");
             }
             System.out.println("");
         }
     }
     public static void printTriangle_2(int n){
         for(int i=1;i<=n;i++){
             for(int j=1;j<=n-i+1;j++)
                 System.out.print("*");
             System.out.println("");
         }

     }
     public static void printTriangle_3(int n){
         for(int i=1;i<=n/2+1;i++){
             for(int j=1;j<=i;j++)
                 System.out.print("*");
             System.out.println("");
         }
         for(int i=1;i<=n/2;i++){
             for(int j=1;j<=n/2-i+1;j++)
                 System.out.print("*");
             System.out.println("");
         }
     }
     public static void printTriangle_4(int n){
         for(int i=1;i<=n;i++){//I is the number of rows
             for(int k=1;k<=n-i;k++)//K represents the number of blanks printed on the current line
                 System.out.print(" ");
             for(int j=1;j<=2*i-1;j++)//J represents the number of * currently printed
                 System.out.print("*");
             System.out.println();
         }
     }

 }
 

public class Test {
     public static void main(String[] args){
         for(int i=100;i<1000;i++){
             int x =i/100;
             int y =i/10%10;
             int z =i%10;
             if(i==x*x*x+y*y*y+z*z*z)
                 System.out.println(i);
         }
     }
 }