• StringBuffer


     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
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  • 原文地址:https://www.cnblogs.com/celine/p/8462008.html
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