How to use java dynamic binding method

Usage

1. When the program is compiled, it actually calls the eat method of the parent class, but at runtime, it runs the eat method of the subclass. Binding occurred during runtime.

2. Use the preamble, first transform upward, and call the overridden method of the parent class and subclass with the same name through the parent class reference

Instance

package chapeter04;
 
class Test
{
public Test() { }
public void setName(String n)
{
this.name=n;
System.out.println("在父类中");
}
public String getName()
{
return this.name;
}
private String name;
}
 
public class Sample4_12 extends Test
{
public void setArea(String a)
{
this.area=a;
}
 
public String getArea()
{
return this.area;
}
public static void main(String[] args)
{
// TODO Auto-generated method stub
Sample4_12 child = new Sample4_12();
Test test []=new Test[2];
test[0]=child;
test[0].setName("silence");
test[1]=new Test();
}
private String area;
 
}

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