java基础

1.字符串

class StringEqualTest {

 

    public static void main(String[] args) {

        String s1 = "Programming";

        String s2 = new String("Programming");

        String s3 = "Program" + "ming";

        System.out.println(s1 == s2);

        System.out.println(s1 == s3);

        System.out.println(s1 == s1.intern());

    }

}

 

2.GC是在什么时候，对什么东西，做了什么事情