Java面试中涉及的String常考题

package test.string;

public class StringTest {

	public static void main(String[] args) {
		String s = new String("abc");//这一行创建了几个对象，分别是
		
		String s1 = "abc";//这一行结束，共创建了几个对象，分别是
		
		String s2 = new String("abc");//这一行结束，共创建了几个对象，分别是
		
		System.out.println(s == s1);
		System.out.println(s == s2);
		System.out.println(s1 == s2);
		
		System.out.println(s == s.intern());
		System.out.println(s.intern() == s2.intern());
		System.out.println(s1.intern() == s2.intern());
		System.out.println(s1 == s.intern());
		
		String hello = new String("hello");
		String hel = "hel";
		String lo = "lo";
		System.out.println(hello == hel + lo);
		System.out.println(hello == "hel" + "lo");
		System.out.println(hello == "hel" + lo);
		
		String hello2 = "hello";
		System.out.println(hello2 == hel + lo);
		System.out.println(hello2 == "hel" + "lo");
		System.out.println(hello2 == "hel" + lo);
	}

}