Java for循环实例，嵌套循环

    public class HelloJava {
        /**
         * hello java
         */
        public static void fenge() { //华丽分割线
            System.out.println("--------------------------------------------------------");
        }
        public static void main(String[] args) {

            /*打印九九乘法表*/
            for(int i = 1;i <= 9;i++){
                for(int j = 1; j <=i;j++ ){
                    System.out.print(j +"*"+i+"="+(i*j)+"\t");
                }
                System.out.println("");//换行
            }
            fenge();
            /*打印正方形*/
            for(int i = 1;i <=5;i++) {
                for(int j = 1; j<=10;j++) {
                    System.out.print("*");
                }
                System.out.println("");//换行
            }
            fenge();
            /*打印平行四边形*/
            for(int i = 1;i <= 5;i++) {
                for(int j = 1;j <=i;j++) {
                    System.out.print(" ");
                }
                for(int k = 1;k <=15;k++) {
                    System.out.print("*");
                }
                System.out.println();
            }
            fenge();
            /*打印菱形*/
            for(int i = 5;i >=1;i--){
                for(int j = 1;j <=i;j++) {
                    System.out.print(" ");
                }
                for(int k =9;k >=(2*i)-1;k--) {
                    System.out.print("*");
                }
                System.out.println();
            }
            for(int i = 1;i <=4;i++){
                for(int j = 1;j <=i+1;j++) {
                    System.out.print(" ");
                }
                for(int k =7;k >=(2*i)-1;k--) {
                    System.out.print("*");
                }
                System.out.println();
            }
        }
    }