Java Exercise 1

Look at the recent Bi Xiangdong's Java video, do want to switch to a Java developer.

Here is appearing in the video programming exercises:

1, for loop follows a pattern printout
*****
****
***
**
*

Code:

 1 class Demo
 2 {
 3     public static void main(String[] args)
 4     {
 5         for(int i=0;i<5;i++) {
 6             for(int j=0;j<5-i;j++) {
 7                 System.out.print("*");
 8             }
 9             System.out.println();
10         }
11     }
12 }

operation result:

2, with the following pattern printout for loop
*
**
***
****
*****

Code:

 1 class Demo
 2 {
 3     public static void main(String[] args)
 4     {
 5         for(int i=0;i<5;i++) {
 6             for(int j=0;j<i+1;j++) {
 7                 System.out.print("*");
 8             }
 9             System.out.println();
10         }
11     }
12 }

operation result:

3, for use as a digital output loop
54321
5432
543
54 is
. 5

Code:

 1 class Demo
 2 {
 3     public static void main(String[] args)
 4     {
 5         for(int i=0;i<5;i++) {
 6             for(int j=5;j>i;j--) {
 7                 System.out.print(j);
 8             }
 9             System.out.println();
10         }
11     }
12 }

operation result:

4, for use as a digital output loop
. 1
22 is
333
4444
55555

Code:

 1 class Demo
 2 {
 3     public static void main(String[] args)
 4     {
 5         for(int i=1;i<=5;i++) {
 6             for(int j=i;j>0;j--) {
 7                 System.out.print(i);
 8             }
 9             System.out.println();
10         }
11     }
12 }

operation result:

5, the multiplication table printout
1 * 1 = 1
1 = 2 * 2 * 2 = 4 2
1 2 * 3 * 3 = 63 = 3 * 3 = 9

……

Code:

 1 class Demo
 2 {
 3     public static void main(String[] args)
 4     {
 5         for(int i=1;i<=9;i++) {
 6             for(int j=1;j<=i;j++) {
 7                 System.out.print(j+"*"+i+"="+i*j+"\t");
 8             }
 9             System.out.println();
10         }
11     }
12 }

运行结果：

------------------------------------------------------------------2019.6.9-----------------------------------------------------------

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