求java的实现继承的一个列子？
A 输出１
B 输出２
要能用的
[解决办法]
class Parent{
public Parent(){
System.out.println( "1 ");
}
}
public class Child extends Parent{
public Child(){
System.out.println( "2 ");
}
public static void main(String[] args) {
new Child();
}
}
[解决办法]
class Parent{
public Parent(){
public void test(){
System.out.println( "1 ");
}
}
}
public class Child extends Parent{
public Child(){
//覆盖上层方法
public void test(){
System.out.println( "2 ");
}
}
}
test.java:
public static void main(String[] args) {
Parent a = new Parent();
Child b = new Child();
a.test();
b.test();
}
[解决办法]
//父类
class Parent{
public Parent(){
private void test(){
System.out.println( "1 ");
}
}
}
//子类继承父类
class Child extends Parent{
public Child(){
//覆盖上层方法
private void test(){
System.out.println( "2 ");
}
}
}
public class test{
public static void main(String[] args) {
Parent a = new Parent();
Child b = new Child();
a.test();
b.test();
}
}
[解决办法]
public class Test {
public static void main(String[] args) {
Parent p1 = new Parent();
Parent p2 = new Child();
p1.test();
p2.test();
}
}
class Parent {
public void test() {
System.out.println( "My name is Parent. ");
}
}
class Child extends Parent {
public void test() {
System.out.println( "My name is Child. ");
}
}
[解决办法]
你照着”蟑螂“的代码自己重新打一遍，不要ctrl+c,他上面的代码带空格～
[解决办法]
学习
[解决办法]
class Parent
{
Parent(){}
void show(){
System.out.println( "1 ");
}
}
class Child extends Parent
{Child(){}
void disp(){
System.out.println( "2 ");}
}
class ParentTest{
public static void main(String[] args)
{
Parent a = new Parent();
Child b = new Child();
a.show();
b.disp();
}
}
[解决办法]
还是用IDE方便～
[解决办法]
用eclipse，再把他们的代码敲进去，复制总是会出现一些意外的！
