我如何实现直方图 [英] How do I implement histogram
问题描述
我应该为特定字符串创建直方图...计算字符串中字符的出现次数并绘制直方图。
什么我试过了：
我尝试了这段代码，但是重复输出我怎么能只显示一次发生
< br $>
String s = wordSt;
s = s.toLowerCase（）;
String result =;
StringBuilder sb = new StringBuilder（s）;
while（ sb.length（）！= 0）{
int count = 0;
char test = sb.charAt（0）;
while （sb.indexOf（test +）！= -1）{
sb.deleteCharAt（sb.indexOf（test +））;
count ++;
}
//System.out.println(test+重复+ count +次数）;
result = result + + test + count;
}
System.out.print LN（结果）;
我需要输出计数一次不重复
字符串为ABC ABC ABC 123
输出为
C（2）**
D（1）*
1（1）*
A（3）***
B（3）***
C（2）**
D（1）*
1 （1）*
2（1）*
A（3）***
B（3）***
C（2）**
D（1）*
1（1）*
2（1）*
3（1）*
A（3）***
B（3）***
C（2）**
D（1）*
I am supposed to create a histogram for specific string ... count the occurrences of the characters in the string and plot the histogram.
What I have tried:
I tried this code but the output is repeated how can i just show the occurrence once
String s =wordSt;
s =s.toLowerCase();
String result="";
StringBuilder sb = new StringBuilder(s);
while(sb.length() != 0){
int count = 0;
char test = sb.charAt(0);
while(sb.indexOf(test+"") != -1){
sb.deleteCharAt(sb.indexOf(test+""));
count++;
}
//System.out.println(test+" is repeated "+count+" number of times");
result=result + " "+test+count;
}
System.out.println(result);
I need the output to count once not to repeat
The string is " ABC ABC ABC 123"
The output is
C (2) **
D (1) *
1 (1) *
A (3) ***
B (3) ***
C (2) **
D (1) *
1 (1) *
2 (1) *
A (3) ***
B (3) ***
C (2) **
D (1) *
1 (1) *
2 (1) *
3 (1) *
A (3) ***
B (3) ***
C (2) **
D (1) *
推荐答案
我需要输出计数一次不重复
I need the output to count once not to repeat
你知道输入，实际输出和你想要的输出。
剩下的唯一事情是使用调试器来理解代码如何构建输出。一旦你知道出了什么问题，纠正错误应该不复杂。
据我所知，你得到的输出不是来自这个代码而你在输出中得到一些D但输入中没有。
您的代码将输入转换为小写，但输出为大写。
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。
You know the input, the actual output and the output you want.
The only thing remaining is using the debugger to understand how your code build the output. Once you know how things go wrong, correcting the bug should not be complicated.
As far as I understand, the output you get do not come from this code and you get some D in output but there is none in input.
Your code convert the input to lowercase, but the output is uppercase.
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.
这篇关于我如何实现直方图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
