子函数的创建，父函数构造函数的实现情况
package homework;
class Grandparent
{
public Grandparent()
{
System.out.println("GrandParent Created.");
}
public Grandparent(String string)
{
System.out.println("GrandParent Created.String:" + string);
}
}
class Parent extends Grandparent
{
public Parent()
{
//super("Hello.Grandparent.");
System.out.println("Parent Created");
// super("Hello.Grandparent.");
}
}
class Child extends Parent
{
public Child()
{
System.out.println("Child Created");
}
}
public class text
{
public static void main(String args[])
{
Child c = new Child();
}
}
在执行子类的构造函数时必须先执行父类的构造函数，子类继承父类，首先要定义出一个父类才能定义子类
若不想函数继续被继承下去，可以在class前面加上final代表这是最后一代，无法被继续继承，声明的方法不允许被覆盖，变量不允许更改
public final class text
{
private final String detail;
private final String postCode;
public text()
{
this.detail = "";
this.postCode = "";
}
public text(String detail , String postCode)
{
this.detail = detail;
this.postCode = postCode;
}
public String getDetail()
{
return this.detail;
}
public String getPostCode()
{
return this.postCode;
}
public boolean equals(Object obj)
{
if (obj instanceof text)
{
text ad = (text)obj;
if (this.getDetail().equals(ad.getDetail()) && this.getPostCode().equals(ad.getPostCode()))
{
return true;
}
}
return false;
}
public int hashCode()
{
return detail.hashCode() + postCode.hashCode();
}
package homework;
public class text {
/**
* @param args
*/
public static void main(String[] args) {
System.out.println(new A());
}
}
class A{}
标签：String,text,动脑,detail,class,动手,postCode,10.12,public From： https://www.cnblogs.com/xuxingkai/p/17763702.html