Java 分派

静态分派

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重载属于静态分派 靠静态类型来判断

public void sayHello(Human guy){
        System.out.println("hello human");
}
public void sayHello(Man guy){
        System.out.println("hello man");
}
public void sayHello(Woman guy){
        System.out.println("hello woman");
}
Human man=new Man();
Human woman =new Woman();
sayHello(man);
sayHello(woman);

如上代码中输出为:

hello human
hello human

动态分派

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重写属于动态分派 靠实际类型来判断

public abstract class Human{
        public abstract void sayHello();
}
public class Man extends Human{
        public void sayHello(){
                System.out.println("hello man");
        }
}
public class Woman extends Human{
        public void sayHello(){
                System.out.println("hello woman");
        }
}
Human man=new Man();
Human woman =new Woman();
man.sayHello();
woman.sayHello();
man=new Woman();
man.sayHello();

如上代码输出为:

hello man
hello woman
hello woman

单分派 多分派

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java中 静态分派属于多分派，动态分派属于单分派。