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 }
