From the above introduction, it is now clear that to make anything final we just have to add a final prefix to it. So to make a final class in Java, add a final keyword in front of the class. A final class in Java cannot be inherited or extended, meaning that no subclass can be ...
final class A {},这样定义的类A就是最终类,最终类不可被继承,也就是说,不能写这样的代码,class B extends A {}了。 final void B() {},这样定义的方法就是最终方法,最终方法在子类中不可以被重写,也就是说,如果有个子类继承这个最终方法所在的类,那么这个子类中就不能再出现void B() {}这样的方法...
In Java, a class can be marked as final, which means that it cannot be subclassed. This can be useful in a number of situations:
A final class can be extended? A final method can be overridden? A final method can be inherited? 答案 final方法将方法声明为final,那就说明你已经知道这个方法提供的功能已经满足你要求,不需要进行扩展,并且也不允许任何从此类继承的类来覆写这个方法,但是继承仍然可以继承这个方法,也就是说可以直接使用....
publicclassNestedIfDemo{ publicstaticvoidmain(String[] args){ intage =20; booleanhasVoterId =true; booleanisCitizen =true; if(isCitizen) {// 外层条件:是否为公民 System.out.println("Verified as a citizen."); if(age...
}classViolinextendsInstrument {/*public void what() { System.out.println("This is a Violin"); }*/publicvoidplay() { System.out.println("Violin play!"); } } 上述例子中,基类中的what方法用final修饰,使得继承他的子类都不能重写what方法,但是他们依然可以调用该方法。我们用private关键字依然可以不...
C)The program has a compile error because you attempted to invoke the Circle class's constructor illegally. 9)What is the output of the following code: public class Test { public static void main(String[ ] args) { Object o1 = new Object(); Object o2 = new Object(); System.out.print...
public class MyClass { // 静态同步方法 public static synchronized void myStaticSyncMethod() { // 这里是同步代码块 System.out.println("This is a static synchronized method."); } // 普通同步方法(非静态) public synchronized void myInstanceSyncMethod() { // 这里是同步代码块 System.out.println...
A.static B.final C.public D.void 【正确答案】A 【答案解析】此题目考查的是Java中的static关键字。 在Java语言中,由static关键字修饰的方法为静态方法,可以通过类名来直接调用。所以本题正确的选项为A。 2、【单选题】下列Java代码运行的结果是()。
static final JavaVersion OFF Static value 'Off' for JavaVersion. Constructor Summary 展開資料表 ConstructorDescription JavaVersion() Deprecated Use the fromString(String name) factory method. Creates a new instance of JavaVersion value. Method Summary 展開資料表 Modifier and TypeMethod and...