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Detailed explanation of for loop Java applet

高洛峰
Release: 2017-03-27 11:54:31
Original
2270 people have browsed it

1、
/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/* 
此图是运行结果: 
**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *
*/
public class XingHaoOne {
public static void main(String[] args) {
 for(int i=10;i>0;i--){
  for (int j=0; j < 10-i; j++) {

         System.out.print(" ");
        }

     for(int o=i;o>0;o--){
       System.out.print("*");
     }
  System.out.print("\n");
    }
  }

2、
/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/*
此图是打印结果: 

*
**
***
****
*****
******
*******
********
*********
**********

*/
public class XingHaoTwo {

public static void main(String[] args) {
 for(int i=10;i>0;i--){ 
     for(int n=i;n<11;n++){ 

       System.out.print("*");
      }
  System.out.print("\n");
    }
  }
}

3、
/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/*
此图是运行结果:

**********
*********
********
*******
******
*****
****
***
**
*

*/
public class XingHaoThree {

public static void main(String[] args) {
 for(int i=10;i>0;i--)
 {
  for(int j=0;j  System.out.print("*");
 System.out.print("\n");
 }
}
}

4、
/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/*
此图是打印结果:

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

*/
public class XingHaoFour {

public static void main(String[] args) {
 for(int i=10;i>0;i--)
 {
  for(int j=i;j>1;j--){
    System.out.print(" ");}
  
  for(int n=i;n<11;n++){
       System.out.print("*");
     }
  
 System.out.print("\n");
 }

}

}

5、
/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/*
此图是运行结果:

***********
***********
***********
***********
***********
***********
***********
***********
***********
***********

*/
public class XingHaoJuXing {

public static void main(String[] args) {
 
 for(int i=10;i>0;i--){
  
  for(int n=0;n  System.out.print("*");
  }
  
  for(int j=i;j<11;j++){
  System.out.print("*");
  }
  System.out.print("\n");
  
 }
}
}

6、
/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/*
此图是打印结果: 

**********
**********
**********
**********
**********
**********
**********
**********
**********
**********

*/
public class Shishi {

public static void main(String[] args) {
 for(int i=10;i>0;i--){
  for(int f=0;f<10;f++){ 
  System.out.print("*");}

  System.out.print("\n");

   }
}
}

再来个带 注释 的 :

/*
* Created on 2004-8-22
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author diyer6
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/*
此图是打印结果:

0**********
00*********
000********
0000*******
00000******
000000*****
0000000****
00000000***
000000000**
0000000000*

*/
public class Zaishi {

public static void main(String[] args) {
 for(int i=10;i>0;i--){
  for(int j=i;j<11;j++){ //j=10;j<11;循环一次,打印一个 0 ,在执行 j++ ,
                  //此时j=11;i<11;为false,所以在第一行只打印了一个 0 。
  System.out.print("0");}
  for(int n=i;n>0;n--){ /*n=10;n>0;循环一次,打印一个 * ,在执行n--,
             *此时n=9;n>0;再循环一次,再打印一个 * ,在执行n--,
             *此时n=8;n>0;再循环一次,再打印一个 * ,在执行n--,
             *依次类推... 所就在第一行打印了10个 * 。
             *接下来执行 System.out.print("\n"); 换行 。
             *然后执行第一个大循环中的 i-- ; 此时 i 就等于 9 了。
             *
             *这时 第一个小循环 中:(j=i 从 i=9 开始循环)
             *j=9;j<11;循环两次,所以在第二行只打印 2 个 0 。
             *这时 第二个小循环 中:(n=i 从 i=9 开始循环)
             *n=9;n>0;循环一次,打印一个 * ,在执行n--,
             *此时n=8;n>0;再循环一次,再打印一个 * ,在执行n--,
             *依次类推... 所就在第二行打印了 9 个 * 。
             *接下来执行 System.out.print("\n"); 换行 。
             *然后执行第一个大循环中的 i-- ; 此时 i 就等于 8 了。
             *
             *往下 依次类推....
           */
  System.out.print("*");
  }
 
 System.out.print("\n");
 }
}
}
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