從零自學Java-4.使用字元串來交流

1.使用字元串來存儲文本；

2.在程式中顯示字元串；

3.在字元串中包含特殊的字元；

4.拼接字元串；

5.在字元串中包含變數；

6.比較字元串；

7.判斷字元串的長度；

程式Credits：顯示一部電影的導演和演員名單

 1 package com.jsample;
 2 
 3 public class Credits {//將該Java程式命名為Credits
 4     public static void main(String[] args){//main()塊語句的開頭，程式所有功能都在這裡完成
 5         //set up from flim information
 6         String title = "Sharknado";//創建用於存儲導演和演員以及影片信息的變數
 7         int year = 2013;           //其中一個是整型變數，其他都是字元串變數
 8         String director = "Anthony Ferrante";
 9         String role1 = "Fin";
10         String actor1 = "Ian Ziering";
11         String role2 = "April";
12         String actor2 = "Tara Reid";
13         String role3 = "George";
14         String actor3 = "John Heard";
15         String role4 = "Nova";
16         String actor4 = "Cassie Scerbo";
17         //display information
18         System.out.println(title + " (" + year +")\n" + //長語句，輸出內容
19             "A " + director + " film.\n\n"  +           //換行符\n用於換行
20             role1 + "\t" + actor1 + "\n" +              //製表符\t用於對齊
21             role2 + "\t" + actor2 + "\n" +
22             role3 + "\t" + actor3 + "\n" +
23             role4 + "\t" + actor4);
24     }//結束main()函數
25 }//程式結束

輸出：

Sharknado (2013)
A Anthony Ferrante film.

Fin Ian Ziering
April Tara Reid
George John Heard
Nova Cassie Scerbo

程式Favorite：通過比較兩個字元串大小來完成猜詞游戲

 1 package com.jsample;
 2 
 3 public class Favourite {
 4     public static void main(String[] args){
 5         String favorite = "chainsaw";
 6         String guess = "pool cue";
 7         System.out.println("Is Fin's favorite weapon a " + guess + "?");
 8         System.out.println("Answer: " + favorite.equals(guess));
 9         System.out.println("Change guess's value from pool cue to chainsaw");
10         guess = "chainsaw";
11         System.out.println("Answer: " + favorite.equals(guess));
12     }
13 }

輸出：

Is Fin's favorite weapon a pool cue?
Answer: false
Change guess's value from pool cue to chainsaw
Answer: true

程式：CreditsHighCase：顯示一部電影的導演和演員（大寫）名單

 1 package com.jsample;
 2 
 3 public class CreditsHighCase {
 4     public static void main(String[] args){//main()塊語句的開頭，程式所有功能都在這裡完成
 5         //set up from film information
 6         String title = "Sharknado";//創建用於存儲導演和演員以及影片信息的變數
 7 
 8         int year = 2013;           //其中一個是整型變數，其他都是字元串變數
 9         String director = "Anthony Ferrante";
10         director = director.toUpperCase();
11 
12         String role1 = "Fin";
13         role1 = role1.toUpperCase();
14 
15         String actor1 = "Ian Ziering";
16         actor1 = actor1.toUpperCase();
17 
18         String role2 = "April";
19         role2 = role2.toUpperCase();
20 
21         String actor2 = "Tara Reid";
22         actor2 = actor2.toUpperCase();
23 
24         String role3 = "George";
25         role3 = role3.toUpperCase();
26 
27         String actor3 = "John Heard";
28         actor3 = actor3.toUpperCase();
29 
30         String role4 = "Nova";
31         role4 = role4.toUpperCase();
32 
33         String actor4 = "Cassie Scerbo";
34         actor4 = actor4.toUpperCase();
35         //display information
36         System.out.println(title + " (" + year +")\n" + //長語句，輸出內容
37                 "A " + director + " film.\n\n"  +           //換行符\n用於換行
38                 role1 + "\t" + actor1 + "\n" +              //製表符\t用於對齊
39                 role2 + "\t" + actor2 + "\n" +
40                 role3 + "\t" + actor3 + "\n" +
41                 role4 + "\t" + actor4);
42     }//結束main()函數
43 }

輸出：

Sharknado (2013)
A ANTHONY FERRANTE film.

FIN IAN ZIERING
APRIL TARA REID
GEORGE JOHN HEARD
NOVA CASSIE SCERBO