Java type inference record one kind of special use of the keyword var

About Java var type inference, there is a special usage, as follows:

• It does not declare an anonymous class object before var type and call its methods.

Object obj = new Object() {
    public void test() {
        System.out.println("test");
    }
};
obj.test(); // 错误的用法，Object类型没有test方法

(new Object() {
    public void test() {
        System.out.println("test");
    }
}).test(); // 正确的做法

• After using type var

var obj = new Object() {
    public void test() {
        System.out.println("test");
    }
};
...
obj.test();