String

 1         /**
 2          * 无参数构造
 3          * */
 4         String s = new String();
 5 
 6         /**
 7          * 字符数组构造
 8          * */
 9 
10         char chars[] = {'A', 'B', 'C'};
11         String s1 = new String(chars);
12         System.out.println(s1);
13 
14         /**
15          * 字节数字构造
16          * */
17         byte bytes[] = {92, 20, 32};
18         String s2 = new String(bytes);
19         System.out.println(s2);
20 
21         /**字符串判断方法
22          * */
23 
24         String str1 = "hello";
25         String str2 = "hello";
26         String str3 = "hello";
27         System.out.println(str1.equals(str2));
28         System.out.println(str2.equals(str3));
29         System.out.println(str1.equals(str3));
30 
31         /**判断字符串相等忽略大小写
32          * */
33 
34         String str4 = "Jack";
35         String str5 = "jack";
36         System.out.println(str4.equalsIgnoreCase(str5));
37 
38         /** 判断地址值
39          * */
40 
41         String str6 = str1;
42         char chars2[] = {'h', 'e', 'l', 'l', '0'};
43         String str7 = new String(chars2);
44 
45         System.out.println(str1 == str6);
46         System.out.println(str7 == str6);
47 
48         /**
49          * 获取方法
50          * */
51         System.out.println(str1.length());
52         System.out.println(str1.concat(str2));
53         System.out.println(str1.charAt(0));
54         System.out.println(str1.indexOf('h'));
55         System.out.println(str1.substring(1, 3));
56         System.out.println(str1.substring(0, str1.length()));
57 
58         /**
59          * 转化方法
60          * */
61 
62         char[] chars1 = str1.toCharArray();
63         for (int i = 0; i < chars1.length ; i++) {
64            System.out.println(chars1[i]);
65         }
66 
67         byte[] bytes1 = str1.getBytes();
68         for (int i = 0; i <bytes.length ; i++) {
69             System.out.println(bytes1[i]);
70         }
71 
72         System.out.println(str1.replace("h", "*"));
73 
74         /**
75          * 分割方法
76          * */
77         String str008 = "hello world";
78         String[] split = str008.split("");
79         for (int i = 0; i < split.length ; i++) {
80             System.out.println(split[i]);
81         }