1 package com.jdk7.chapter5;
2 /**
3 *
4 * @author Administrator
5 *
6 */
7 public class StringBufferTest {
8
9 public static void findStr(StringBuffer sb, String dest){
10 System.out.println("指定匹配开始的位置"+"("+sb+")"+".indexOf("+dest+")>"+
sb.indexOf(dest));
11 System.out.println("指定匹配开始的位置"+"("+sb+")"+".indexOf("+dest+", 4)>"+sb.indexOf(dest, 4
));
12 System.out.println("指定匹配结束的位置"+"("+sb+")"+".lastIndexOf("+dest+")>"+
sb.lastIndexOf(dest));
13 System.out.println("指定匹配结束的位置"+"("+sb+")"+".lastIndexOf("+dest+", 4)>"+sb.lastIndexOf(dest, 2
));
14 }
15
16 public static void subStr(StringBuffer sb,
int n,
int m){
17 System.out.println("从位置"+n+"开始截取"+"("+sb+").substring("+n+")>"+
sb.substring(n));
18 System.out.println("从位置"+n+"开始到"+m+"结束截取"+"("+sb+").substring("+n+", "+m+")>"+
sb.substring(n, m));
19 }
20
21 public static void charAt(StringBuffer sb,
int n){
22 System.out.println("返回位置"+n+"的字符("+sb+").charAt("+n+")"+
sb.charAt(n));
23 }
24
25 public static void append(){
26 StringBuffer sb =
new StringBuffer();
27 sb.append("Hello").append(" ").append(
new char[]{'w','o','r','l','d','!'}).append(3).append(
true).append(6.44d
)
28 .append(78.445f
);
29 System.out.println("append>"+
sb.toString());
30 }
31
32 public static void insert(StringBuffer sb,
int n){
33 System.out.println("("+sb+").insert>"+sb.insert(n,
false).insert(n, 'b').insert(n,
new char[]{'w','o','r','l','d','!'
})
34 .insert(n, 33.55d).insert(n, 7768.22f).insert(n, 66
));
35 }
36
37 public static void delete(StringBuffer sb,
int start,
int end){
38 System.out.println("("+sb+").delete("+start+", "+end+")>"+
sb.delete(start, end));
39 System.out.println("("+sb+").deleteCharAt("+start+")>"+
sb.deleteCharAt(start));
40 }
41
42 public static void replace(StringBuffer sb,
int start,
int end, String str){
43 System.out.println("("+sb+").replace("+start+", "+end+", "+str+")>"+
sb.replace(start, end, str));
44 }
45
46 public static void reverse(StringBuffer sb){
47 System.out.println("("+sb+").reverse()>"+
sb.reverse());
48 System.out.println("("+sb+").capacity()"+
sb.capacity());
49 }
50 public static void main(String[] args) {
51 StringBuffer sb =
new StringBuffer("This is an object!"
);
52 StringBufferTest.findStr(sb, "is"
);
53 StringBufferTest.subStr(sb, 2, 10
);
54 StringBufferTest.charAt(sb, 6
);
55 StringBufferTest.append();
56 StringBufferTest.insert(sb, 10
);
57 StringBufferTest.delete(sb, 2, 7
);
58 StringBufferTest.replace(sb, 2, 7, "hello"
);
59 StringBufferTest.reverse(sb);
60 }
61 }
62
63 执行结果：
64 指定匹配开始的位置(This is an object!).indexOf(is)>2
65 指定匹配开始的位置(This is an object!).indexOf(is, 4)>5
66 指定匹配结束的位置(This is an object!).lastIndexOf(is)>5
67 指定匹配结束的位置(This is an object!).lastIndexOf(is, 4)>2
68 从位置2开始截取(This is an object!).substring(2)>is is an object!
69 从位置2开始到10结束截取(This is an object!).substring(2, 10)>
is is an
70 返回位置6的字符(This is an object!).charAt(6
)s
71 append>Hello world!3true6.4478.445
72 (This is an object!).insert>This is an667768.2233.55world!bfalse object!
73 (This is an667768.2233.55world!bfalse object!).delete(2, 7)>Th an667768.2233.55world!bfalse object!
74 (Th an667768.2233.55world!bfalse object!).deleteCharAt(2)>Than667768.2233.55world!bfalse object!
75 (Than667768.2233.55world!bfalse object!).replace(2, 7, hello)>Thhello768.2233.55world!bfalse object!
76 (Thhello768.2233.55world!bfalse object!).reverse()>!tcejbo eslafb!dlrow55.3322
.867ollehhT
77 (!tcejbo eslafb!dlrow55.3322.867ollehhT).capacity()70
转载于:https://www.cnblogs.com/celine/p/8462008.html
相关资源：数据结构—成绩单生成器
