package String;

import org.junit.Test;

public class StringMethodTest {

@Test

public void test4(){

String str1 = "helloworld";

System.out.println(str1.replace('h', 'H'));

}

@Test

public void test3(){

String str1 = "helloworld";

System.out.println(str1.endsWith("ld"));

System.out.println(str1.startsWith("hh"));

//记录指定字符串的内容以及开始的位置

System.out.println(str1.startsWith("ll", 2));

System.out.println(str1.contains("wo"));

//返回字符串的角标，如果没有则返回-1

System.out.println(str1.indexOf("lo"));

System.out.println(str1.lastIndexOf("or"));

}

@Test

public void test2(){

String s1 = "HelloWorld";

String s2 = "helloworld";

System.out.println(s1.equals(s2));

System.out.println(s1.equalsIgnoreCase(s2));

String s3 = "abc";

String s4 = s3.concat("def");

System.out.println(s4);

String s5 = "abc";

String s6 = "abe";

//逐个比较两个字符串，返回值数据类型为int

System.out.println(s5.compareTo(s6));//用于通讯录排序

String s7 = "helloworld";

System.out.println(s7.substring(3));

System.out.println(s7.substring(2, 4));

}

@Test

public void test1(){

String s1 = "HelloWorld";

System.out.println(s1.length());

System.out.println(s1.charAt(0));

System.out.println(s1.isEmpty());

String s2 = s1.toLowerCase();

System.out.println(s2);

String s3 = " hello w orld ";

//去除首尾的空格

String s4 = s3.trim();

System.out.println(s4);

}

}