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覆盖(override)

继承了父类的同名无參函数:当子类从父类继承一个无參方法,而又定义了一个同样的无参数的方法时,则子类新写的方法覆盖父类的方法,成为覆盖。

Example

class Super{
public void NoParametersMethod(){
System.out.println("Super Method....");
}
} class subClass extends Super {
public void NoParametersMethod(){
System.out.println("subClacc Method....");
}
} class override{
public static void main(String[] args) {
subClass sub = new subClass();
sub.NoParametersMethod();
}
}

Output

subClacc Method....

重载(overload)

继承了父类的同名有參函数:当子类继承了父类的一个同名参数,且方法参数表不同,则称为重载,通过方法重载,子类可以重新实现父类的某些方法,使其具有自己的特征。

Example

class Super{
public void WithParametersMethod(int a){
System.out.println("Super Method:"+a);
}
} class subClass extends Super {
public void WithParametersMethod(int a,int b){
System.out.println("subClacc Method:"+a+","+b);
}
} class overload{
public static void main(String[] args) {
subClass sub = new subClass();
sub.WithParametersMethod(0);
sub.WithParametersMethod(1,2);
}
}

Output

Super Method:0
subClacc Method:1,2

重写(overwrite)

当前类的同名方法:通过方法重写,一个类中可以有多个具有相同名字的方法,由传递给他们的不同个数和类型的参数,甚至不同参数顺序(不推荐)来决定使用哪种方法

Example

class Curr{
public void fun(int i) {
System.out.println("int");
}
public void fun(int i,String s){
System.out.println("int,String");
}
public void fun(String s,int i){
System.out.println("String,int");
}
} class override{
public static void main(String[] args) {
Curr curr = new Curr();
curr.fun(0);
curr.fun(0, "");
curr.fun("", 0);
}
}

Output

int
int,String
String,int

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