java两道简单for循环嵌套

1.使用*打印4x5的矩形

package month9;

public class forfordemo {
    public static void main(String[] args){
        test();
    }
    public static void test(){
        int i = 1;
        int j = 1;
        for(i = 1; i <= 4; i++){
            for(j = 1; j <= 5; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

在java中，使用print打印后不换行,而使用println打印后换行

2.打印九九乘法表

package month9;

public class forfordemo {
    public static void main(String[] args) {
        printTable();
    }
    public static void printTable() {
        int i = 1;
        int j = 1;
        for(i = 1;i<=9;i++){
            for(j = 1;j<=i;j++){
                System.out.print(j + "x" + i + "=" + j*i + "\t");
                //System.out.printf("%dx%d=%d\t",j,i,j*i);
            }
            System.out.println();
        }
    }
}