题解 | 单词替换

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNextLine()){
            String str = scanner.nextLine();
            String originStr = scanner.nextLine();
            String targetStr = scanner.nextLine();
            String [] array = str.split(" ");
            for(int index = 0;index < array.length;index++){
                if(array[index].equals(originStr)){
                    array[index] = targetStr;
                }
            }
            System.out.println(String.join(" ",array));
        }
    }
}