package code;

public class MyCode {

    public int m1(){

        System.out.println("数字型");

        return 1;

    }

    public String m2(){

        System.out.println("null");

        return null;

    }

    public boolean m3(){

        System.out.println("boolean");

        return true;

    }

    //------------------------------------------

    static MyCode obj = new MyCode();

    public MyCode m4_1(){

        System.out.println("obj");

        return obj;

    }

    public MyCode m4_2(){

        System.out.println("obj");

        return obj;

    }

}

package test;

import code.MyCode;

import junit.framework.TestCase;

public class TestJunit extends TestCase {

    public void testM1() {

        MyCode mc = new MyCode();

        assertEquals(1, mc.m1());

    }

    public void testM2() {

        MyCode mc = new MyCode();

        assertNull(mc.m2());

    }

    public void testM3() {

        MyCode mc = new MyCode();

        assertTrue(mc.m3());

    }

    public void testM4() {

        MyCode mc = new MyCode();

        assertSame(mc.m4_1(), mc.m4_2());

    }

    public static void main(String[] args) {

        /*

         * 由此 Class 对象建模的类的类型。例如，String.class 的类型是 Class<String>。

         */

        junit.textui.TestRunner.run(TestJunit.class);

    }

}