String类的其他功能replace、compareTo

package cn.lgt.stringmethods;

public class StringOtherMethods {
    public static void stringOtherMehtods(){
        //String类的其他功能

        //替换功能
        //1. String replace(char old, char new);
        //2. String replace(String old, String new);
        String s1 = "helloworld";
        System.out.println(s1.replace('o', 'm'));
        System.out.println(s1.replace("world", "java"));
        //去除字符串两端的空格
        //String trim();
        String s2 = " dd sss  d   ";
        System.out.println(s2.trim());
        //按照字典顺序比较两个字符串
        //int compareTo(String str);//区分大小写
        //int compareToIgnoreCase(String str);//不区分大小写
        String s3 = "helloworld";
        String s4 = "HELLOWORLD";
        String s5 = "hello";
        String s6 = "world";
        System.out.println(s3.compareTo(s5));//前面都相同，返回相差的字符数
        System.out.println(s3.compareToIgnoreCase(s4));//不区分大小写，相同，返回数值0
        System.out.println(s3.compareTo(s6));
    }
}