OrverrideConstructorTest

OrverrideConstructorTest.java

package com.kamatama41.sandbox4j;

import org.junit.Test;

public class OrverrideConstructorTest {
    
    @Test(expected=NullPointerException.class)
    public void test_Aの初期化時にBのsomeMethodが呼ばれてぬるぽ発生() throws Exception {
        new OrverrideConstructorTest().new B();
    }

    class A {
        A() {
            System.out.println("Construntor of A");
            someMethod();
        }
        void someMethod() {
            System.out.println("Call someMethod of A");
        }
    }
    class B extends A {
        C c;
        B() {
            System.out.println("Construntor of B");
            c = new C();
        }
        @Override
        void someMethod() {
            System.out.println("Call someMethod of B");
            c.doSomething();
        }
    }
    class C {
        void doSomething() {
            System.out.println("test");
        }
    }
}