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//创建一个字符数组
char[] charArr = {‘a‘,‘b‘,‘c‘,‘d‘,‘e‘,‘f‘,‘g‘};
//创建一个字符串
String str = new String(charArr);
System.out.println(str);
String aStr = "abcdefg";
//字符串的比较
boolean results = str.equals(aStr);
System.out.println(results);
//或得所在索引的字符
char ch = str.charAt(3);
System.out.println(ch);
//或得字符的索引
int index = str.indexOf("a");
System.out.println(index);
//得到字符串的一部分字符串
char[] chArr = new char[10];
str.getChars(1,3,chArr,0);
System.out.println(chArr);
//截取字符串
String subStr = str.substring(2);
System.out.println(subStr);
//字符串的拼接
String string1 = "i am string1";
String string2 = "i am string2";
String superStr = string1.concat(string2);
System.out.println(superStr);
//实现字符串大小写的转换
String lowStr = "abcdefghijklmnopqrstuvwsyz";
String upStr = lowStr.toUpperCase();
System.out.println(upStr);
System.out.println(upStr.toLowerCase());
//去掉字符换开头和结尾的空格
String trimStr = " i am a string ";
System.out.println(trimStr.trim());
//将任意类型转化为字符串类型
TestString test = new TestString();
String testStr = test.toString();
System.out.println(testStr);
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原文地址:http://www.cnblogs.com/jianbo-su/p/5841631.html