String类方法

//String类方法
//http://www.chuanke.com/v4242218-139425-449283.html?st=1280


public class TestMethod{
    public static void main(String args[]){
        String s = "Hello World";
        //返回字符串下标为n的字符
        System.out.println("s.charAt:"+s.charAt(1)); 
        
        char [] cs=s.toCharArray();//转化为字符数组
        System.out.println(cs);//Hello World!
        
        System.out.println("------String方法------"); 
        //字符串长度
        System.out.println("s.length:"+s.length()); 
        
        //截取，返回s字符串中下标0到4的子字符串
        System.out.println("s.substring:"+s.substring(0,5));
        //返回子字符串"Hello"的下标
        System.out.println("s.indexOf:"+s.indexOf("Hello"));
        //将s转换为大写字母
        System.out.println("s.toUpperCase:"+s.toUpperCase());
        // 将s转换为小写
        System.out.println("s.toLowerCase:"+s.toLowerCase());
        //替换操作
        System.out.println("s.replace:"+s.replace("World","xiaodeng"));
        //以某字符串开头或结尾
        System.out.println("s.startsWith:"+s.startsWith("Hel"));//true
        System.out.println("当前字符串s为："+s);
        System.out.println("s.endsWith:"+s.endsWith("World"));//可用于判断文件后缀名
        
        //分割split
        String y="xiaodeng FengMei";
        String [] values=y.split(" ");
        for (int i=0;i<values.length;i++){
            System.out.println(values[i]);
        }
    }
}