A: protected int getNumber( ) { return 100; }
B: int getNumber( ) { return 100; }
C: public int getNumber( ) { return 100; }
D: int getNumber( ) { return 'a'+'b'; }
举一反三
- 说出下列B类中【代码1】,【代码2】的输出结果 class A { public int getNumber(int a) { return a+1; } } class B extends A { public int getNumber (int a) { return a+100; } public static void main (String args[]) { A a =new A(); System.out.println(a.getNumber(10)); //【代码1】 a = new B(); System.out.println(a.getNumber(10)); //【代码2】 } }
- 以下程序的运行结果是______ class A{public int getNumber(int a){return a+1;}}class B extends A{public int getNumber(int a, char c){return a+2;} public static void main(String[] args) {B b=new B();System.out.println(b.getNumber(0));} }
- 下列选项中,( )代码替换源文件Com.java中的【代码】不会导致编译错误。public interface com{int M=200;int f();}class ImpCom implements Com{【代码】} A: public int f( ){return 100+M;} B: int f( ){return 100;} C: public double f( ){return 2.6;} D: public abstract int f( );
- 将下列(A,B,C,D)哪个代码替换下列程序中的【代码】不会导致编译错误。 A.public int f(){return 100+M;} B.int f(){return 100;} C.public double f(){return 2.6;}。 D.public abstract int f(); interface Com { int M = 200; int f(); } class ImpCom implements Com { 【代码】 }
- 将下列(A,B,C,D)哪个代码替换下列程序中的【代码】不会导致编译错误。(<br/>) A: public<br/>int f(){return 100+M;} B: int<br/>f(){return 100;} C: public<br/>double f(){return 2.6;}。 D: public<br/>abstract int f();<br/>interface Com {<br/>int M = 200;<br/>int f();}<br/>class ImpCom implements Com {<br/>【代码】}
内容
- 0
Given: Which five methods, inserted independently at line 5, will compile?() A: protected int blipvert(long x) { return 0; } B: protected long blipvert(int x) { return 0; } C: private int blipvert(long x) { return 0; } D: private int blipvert(int x) { return 0; } E: public int blipvert(int x) { return 0; } F: protected long blipvert(long x) { return 0; } G: protected long blipvert(int x, int y) { return 0; }
- 1
Which five methods,inserted independently at line 5,will compile?() A: public int blipvert(int x){return 0;} B: private int blipvert(int x){return 0;} C: private int blipvert(long x){return 0;} D: protected int blipvert(long x){return 0;} E: protected long blipvert(long x){return 0;} F: protected long blipvert(int x, int y){return 0;}
- 2
程序填空:interface Com{ int M=200; int f(); } class ImpCom implements Com{ ___________________________; } A: public int f(){retrun 100+M;} B: int f() {return 100;} C: public double f(){return 2.6;} D: public abstract inf f();
- 3
下列哪个函数是对父类Demo的函数show的正确覆盖class Demo{ int show(int a,int b){ return 0; } } A: private int show(int a,int b){ return 0; } B: public int show(int a,int b){ return 0; } C: static int show(int a,int b){ return 0; } D: public int show(int a,long b){ return 0; }
- 4
阅读程序题(给出【代码】注释标注的代码的输出结果)interface Com {int add(int a, int b);public static int get(int n){return n;}public default int see( int n){return n;}public default int look( int n) {return n;}}class A implements Com{public int add( int a, int b) { return a + b;}public int see(int n){ return n + 1;}}public class 习题5_阅读4{public static void main( String args[ ]) {A a = new A();int m = a.add(12,6);int n = Com.get( 12);int t = a.see(6);int q = a.look(6);System.out.printf("%d:%d:%d:%d",m,n, t,q); //【代码】 }}}