equals和equalsIgnoreCase与isEmpty

//equals 在比较字符串时大小写敏感，equalslgnoreCase 在比较字符串相等时会忽略大小写，isEmpty是字符串的判空判断
package com.test.simple;

public class TestEqualForStr {
	
	public static String str1 = "iuserdomain";
	public static String str2 = "IUSERDOMAIN";
	
	public static boolean testEquals(String s1, String s2){
		 boolean isTrue = s1.equals(s2);
		 return isTrue;
	} 
	public static boolean testEqualsIgnoreCase(String s1, String s2){
		boolean isTrue = s1.equalsIgnoreCase(s2);
		return isTrue;
	} 
	
	public static boolean testIsEmpty(String s1){
		boolean isTrue = s1.isEmpty();
		return isTrue;
	} 
	public static void main(String str[]){
		System.out.println(testEquals(str1, str2));
		System.out.println(testEqualsIgnoreCase(str1, str2));
		System.out.println(testIsEmpty(""));
		
	}
	
}

 false

 true

 true