abstract方法使用测试

testA.java

package com.djwl.test.huxiao;

import java.util.UUID;

public class TestA {

	public TestA() {
		System.out.println("step4:constructorA");
	}

	public String getUUID() {
		System.out.println("step5");
		return UUID.randomUUID().toString().replaceAll("-", "");
	}
}

testB.java

package com.djwl.test.huxiao;

public abstract class TestB {

	public abstract TestA getTestA();

	public String test() {
		System.out.println("step2");
		String string = getTestA().getUUID();
		System.out.println("step6");
		return string;
	}
}

testC.java

package com.djwl.test.huxiao;

public class TestC extends TestB {

	@Override
	public TestA getTestA() {
		System.out.println("step3");
		return new TestA();
	}

	public String test() {
		System.out.println("step1");
		return super.test();
	}

	public static void main(String[] args) {
		System.out.println(new TestC().test());
	}
}

运行TestC中的main方法，得到结果如下：

step1
step2
step3
step4:constructorA
step5
step6
151a7579523c40b49215d9831ee8ea2e

 

哦，还是不太懂，继续探索中。。