替换字符串中的字符，不使用字符串 replace() 方法 [英] Replace characters in a string, without using string replace() method

问题描述

我有一个字符串，String originalString="This car is my car";
我想用自行车"替换汽车"，而不使用字符串 replace() 方法.

I have a String , String originalString= "This car is my car";
I want to replace "car" with "bike", without using string replace() method.

class StringTest{
   public static void main(String[] args){
      String originalString = "This car is my car";
      String replacedString = replaceMethod(original, "car", "bike");
      System.out.println(replacedString);
   }  
}
static String replaceMethod( String original, String toReplace, String replacedWith){
    // enter code here
    return "";
}

推荐答案

可以拆分car"，然后添加bike"连接

You can split on "car" and then concatenate with adding "bike"

import java.util.*;

class StringTest 
{
    public static void main(String[] args)
    {
        String originalString = "This car is my car";
        String replacedString = replaceMethod(originalString, "car", "bike");
        System.out.println(replacedString);
    }

    static String replaceMethod(String str, String from, String to) 
    {
        String[] arr = str.split(from);
        StringBuilder output = new StringBuilder();

        int i = 0;
        for (; i < arr.length - 1; i++)
        output.append(arr[i]).append(to);

        output.append(arr[i]);
        if (str.substring(str.lastIndexOf(" ")).equalsIgnoreCase(" " + from))
            output.append(to);

        return output.toString();
    }
}

原始字符串

This car is my car

输出

This bike is my bike

感谢 Polywhirl 先生的帮助.

Thanks for Mr. Polywhirl for his help.

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