String常用的

package lei;

public class TestStringpool {

    public static void main(String[] args) {
    String s="java";
    String s1="java";
    //是否相等
    if(s==s1){
        System.out.println("是同一个对象");
    if(s.equals(s1)){
        System.out.println("内容相等");
    }
    }
    }

}

package lei;

public class TestString2 {

    public static void main(String[] args) {
    //split
        String s="刘备,张飞,关羽,曹操,马云";
         String[]names=s.split(",");
    for(String n:names){
        System.out.println(n);
    }

    String str="  爱情吧不是你想买，想买就能买Abc  ";
    System.out.println(str.isEmpty());
    System.out.println(str.indexOf("买",str.indexOf(‘买‘)+1));
    System.out.println(str.toUpperCase());
    System.out.println(str.trim());

    String s1="matlab";
    String s2="MATLAB";
    System.out.println(s1.equalsIgnoreCase(s2));

    }

}