请解释以下代码 [英] Please explain below codes

问题描述

    import java.io.*;
    import java.util.Scanner;
    import java.lang.String;
public class Amma {
public static void main(String[] args) {
  
           Scanner sc = new Scanner(System.in);
           System.out.println("Enter the String : ");
           String s = sc.nextLine();
          
           for(int i=0; i< s.length();i++)
           {

               for(int j=0;j<i;j++)
               {
            	   
                   System.out.printf("%c ",s.charAt(j));
               }
               System.out.printf("%c\n",s.charAt(i));
               }         

           
       }
          
    }

我尝试了什么：



我也想在左边打印这个怎么样？

a

am

amm

amma

What I have tried:

also i want to print this in left also how?
a
am
amm
amma

推荐答案

所有这一切都是从用户并打印它。它打印的行数与用户输入的字符数相同，每行比前一行长一个字符。



基本上，它就像你说的那样做想要它做，假设你输入amma作为输入。

All it does is read a string from the user and print it. It print the same number of lines as the user entered characters, and each line is one character longer than the one before it.

Basically, it does what you say you want it to do, assuming you enter "amma" as your input.

有一个工具可以让你看到你的代码在做什么，它的名字是调试器。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。

当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。



调试器 - 维基百科，免费的百科全书 [ ^ ]

http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html [ ^ ]

https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html [ ^ ]

调试器在这里向您展示你的代码正在做，你的任务是与它应该做的事情进行比较。

调试器中没有魔法，它没有找到错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[^]
https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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