TQC+ 410 遞迴字串替換

李泳霖

題目說明:
請將檔案另存成JPA04.java，並編譯為JPA04.class
設計說明:
1.請使用遞迴設計一個類別方法，此方法能夠將一個字串內的某個字元換成另一個字元。例如輸入字串[windows]，將字串中的w值替換成g值，輸出字串為[gindogs]。
2.程式執行時，顯示[Input a string: ]要求輸入字串，接續顯示[Input a character: ] 要求輸入[被替換]的字元，最後顯示[Input another character: ]要求輸入替換字元。
3.請利用replace()函數進行字串替換，顯示如執行結果參考畫面。


    replace("windows","w","g")
    ="g"+replace("indows","w","g")
    ="g"+"i"+replace("ndows","w","g")
    ="g"+"i"+"n"+replace("dows","w","g")
    ="g"+"i"+"n"+"d"+replace("ows","w","g")
    ="g"+"i"+"n"+"d"+"o"+replace("ws","w","g")
    ="g"+"i"+"n"+"d"+"o"+"g"+replace("s","w","g")
    ="g"+"i"+"n"+"d"+"o"+"g"+"s"+replace("","w","g")
    ="g"+"i"+"n"+"d"+"o"+"g"+"s"+""
    =gindogs

1. import java.util.Scanner;
   
2. public class JPD04 {
   
3.     static Scanner keyboard = new Scanner(System.in);
   
4.     public static void main(String args[]) {
   
5.         String s, c1, c2;
   
6.         System.out.print("Input a string: ");
   
7.         s = keyboard.nextLine();
   
8.         System.out.print("Input a character: ");
   
9.         c1 = keyboard.nextLine();
   
10.         System.out.print("Input another character: ");
    
11.         c2 = keyboard.nextLine();
    
12.         System.out.printf("%s\n", replace(s, c1, c2));
    
13.     }
    
14.    
    
15.     ...
    
16. }

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