Java中Object对象的hashCode方法和String对象的hashCode

class A{

}

public class TestMain {

public static void main(String[] args) {
A a1 = new A();
A a2 = new A();
String str1 = "abc";
String str2 = new String("abc");

System.out.println(str1 == str2);
System.out.println(str1.equals(str2));
System.out.println(str1);
System.out.println(str2);
System.out.println(str1.hashCode());
System.out.println(str2.hashCode());

//Hash码是标志对象的唯一值，Hash码相同的对象是同一对象
System.out.println(a1.equals(a2));
System.out.println(a1 == a2);
System.out.println(a1);
System.out.println(a2);
System.out.println(a1.hashCode());
System.out.println(a2.hashCode());
}

}