Java将字符添加到字符串 [英] Java add chars to a string

问题描述

我在一个 java 程序中有两个字符串，我想以某种方式混合它们以形成两个新字符串.为此，我必须从每个字符串中提取一些组成字符并将它们添加以形成新字符串.我有这样的代码(this.eka 和 this.toka 是原始字符串):

String muutettu1 = new String();字符串 muutettu2 = 新字符串()；muutettu1 += this.toka.charAt(0) + this.toka.charAt(1) + this.eka.substring(2);muutettu2 += this.eka.charAt(0) + this.eka.charAt(1) + this.toka.substring(2);System.out.println(muutettu1 + " " + muutettu2);

我正在获取 .charAt(x) 部分的数字，那么如何将字符转换为字符串?

解决方案

只要使用 always use substring() 而不是 charAt()

在这种特殊情况下，值是可变的，因此，我们可以使用内置的 String 类方法 substring() 来解决这个问题(@see 下面的例子):

特定于 OP 用例的示例:

<代码>muutettu1 += toka.substring(0,1) + toka.substring(1,2) + eka.substring(2);muutettu2 += eka.substring(0,1) + eka.substring(1,2) + toka.substring(2);

概念示例，(即示例显示在尝试使用此概念解决问题时采用的一般方法)

<代码>muutettu1 += toka.substring(x,x+1) + toka.substring(y,y+1) + eka.substring(z);muutettu2 += eka.substring(x,x+1) + eka.substring(y,y+1) + toka.substring(z);

<块引用>

...其中 x,y,z 是保存要提取的位置的变量."

I have two strings in a java program, which I want to mix in a certain way to form two new strings. To do this I have to pick up some constituent chars from each string and add them to form the new strings. I have a code like this(this.eka and this.toka are the original strings):

String muutettu1 = new String();
String muutettu2 = new String();
muutettu1 += this.toka.charAt(0) + this.toka.charAt(1) + this.eka.substring(2);
muutettu2 += this.eka.charAt(0) + this.eka.charAt(1) + this.toka.substring(2);
System.out.println(muutettu1 + " " + muutettu2);

I'm getting numbers for the .charAt(x) parts, so how do I convert the chars to string?

解决方案

Just use always use substring() instead of charAt()

In this particular case, the values are mutable, consequently, we can use the built in String class method substring() to solve this problem (@see the example below):

Example specific to the OP's use case:

    muutettu1 += toka.substring(0,1) + toka.substring(1,2) + eka.substring(2);
   
    muutettu2 += eka.substring(0,1) + eka.substring(1,2) + toka.substring(2);

Concept Example, (i.e Example showing the generalized approach to take when attempting to solve a problem using this concept)

    muutettu1 += toka.substring(x,x+1) + toka.substring(y,y+1) + eka.substring(z);

    muutettu2 += eka.substring(x,x+1) + eka.substring(y,y+1) + toka.substring(z);

"...Where x,y,z are the variables holding the positions from where to extract."

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