标签：[] i++ 区分大小写 indexof nbsp substring start case 编码
1. equals ， 比较字符串内容，区分大小写
String s1 = "abc"; String s2 = "aBc"; System.out.println(s1.equals(s2)); --->false
2.equalsIgnoreCase ,比较字符串内容，不区分大小写
String s1 = "abc"; String s2 = "aBc"; System.out.println(s1.equalsIgnoreCase(s2)); --->true
3.contains，字符串中是否包含且全部包含，区分大小写
String s1 = "ABCDEF"; String s2 = "F"; String s3 = "f"; System.out.println(s1.contains(s2)); --- >true System.out.println(s1.contains(s3)); --- >false
4.startsWith,判断字符串开始值，区分大小写
String s1 = "ABCDEF";
System.out.println(s1.startsWith("A")); --->true
System.out.println(s1.startsWith("B", 1)); --->true
System.out.println(s1.endsWith("f")); --->false
5.isEmpty ,判断是否为空
String s1 = "ABCDEF"; System.out.println(s1.isEmpty()); --- >false
6.int length()
7.char charAt(int index) 从字符串中返回 所在位置的字符
8.int indexof(int ch) 返回第一次出现的索引
9.int indexOf(String)
10.String subString(int start , (int end) ) 截取字符串
11.getBytes 编码，把字符串转换为字符数组
String s1 = "ABCDEF";
byte[] arr =s1.getBytes();
for(int i=0;i<s1.length();i++){
System.out.println(arr[i]);
}
把字符数组转化为字符串
String s2= new String(arr); System.out.println(s2);
12.string replace(char old ,char new )
13.string replace(String old ,String new)
14.trim()
...不一一列举了
标签：[] i++ 区分大小写 indexof nbsp substring start case 编码
原文地址：http://www.cnblogs.com/lyxin/p/6009703.html
