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相关试题
- 1.请写出程序运行的结果。class Animal{ int m=100; public int seeM() { return m; } public int getM() { return m; }}class Dog extends Animal{ int m=6; public int seeM() { return m; }}public class E {public static void main(String[] args) { Animal a = null; Dog d = new Dog(); a = d; System.out.printf("%d:%d:%d", d.seeM(),a.seeM(),a.getM());}}
- 2.分析以下代码。 public class Test { public static void main(String[] args) { System.out.println(m(2)); } public static int m(int num) { return num; } public static void m(int num) { System.out.println(num); } }
- 3.以下程序的运行结果为（ ）。 class A { public int modify(int a) { return a + 100; }} class B extends A { public int modify(int a) { return a*100; }} class E { public static void main(String args[]) { A a = new A(); System.out.print(a.modify(8)+","); a = new B(); System.out.println(a.modify(8)); }}
- 4.以下哪个方法不可以加入类Son？ class Father{ public void methodOne(int i){} public void methodTwo(int i){} public static void methodTree(int i){} public static void methodFour(int i){} } class Son extends Father{…}
- 5.下列程序中注释的哪两个代码（1、2、3、4）是错误的（无法通过编译）？ class Father { private int money =12; float height; int seeMoney(){ return money ; //1 } } class Son extends Father { int height; int lookMoney() { int m = seeMoney(); //2 return m; } } class E { public static void main(String args]) { Son erzi = new Son(); erzi.money = 300; //3 erzi.height = 1.78F; //4 } } 选项： A:1 B:2 C:3 D:4
- 6.下列程序中注释的哪两个代码（A，B，C，D）是错误的（无法通过编译）？class Father { private int money =12; float height; int seeMoney(){ return money ; //A }}class Son extends Father { int height; int lookMoney() { int m = seeMoney(); //B return m; }}class E { public static void main(String args[]) { Son erzi = new Son(); erzi.money = 300; //C erzi.height = 1.78F; //D }}选项： A:A; B:B; C:C; D:D
- 7.下列程序中注释的哪两个代码（A，B，C，D）是错误的（无法通过编译）？Class Father { private int money =12; float height; int seeMoney(){ return money ; //A } }Class Son extends Father { int height; int lookMoney() { int m = seeMoney(); //B return m; }}Class E { public static void main(String args]) { Son erzi = new Son(); erzi.money = 300; //C erzi.height = 1.78F; //D }} 选项： A: return money ; B: int m = seeMoney(); C: erzi.money = 300; D: erzi.height = 1.78F;
- 8.【单选题】以下哪个方法不可以加入类Son？ （） class Father{public void methodOne(int i){}public void methodTwo(int i){}public static void methodTree(int i){}public static void methodFour(int i){}}class Son extends Father{…}
- 9.请写出E类中【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 E{ 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] } }
- 10.【多选题】下列程序中注释的哪两个代码( A , B , C , D )是错误的(无法通过编译)? class Father { private int money =12; float height; int seeMoney(){ return money ; //A } } class Son extends Father { int h eight ; int lookMoney() { int m = seeMoney(); //B return m; } } class E { public static void main(String args[]) { Son erzi = new Son(); erzi.money = 300; //C erzi.height = 1.78F ; //D } }A. 代码A B. 代码B C. 代码C D. 代码D
- 11.【多选题】下列程序中注释的哪两个代码( A , B , C , D )是错误的(无法通过编译)? class Father { private int money =12; float height; int seeMoney(){ return money ; //A } } class Son extends Father { int height; int lookMoney() { int m = seeMoney(); //B return m; } } class E { public static void main(String args[]) { Son erzi = new Son(); erzi.money = 300; //C erzi.height = 1.78F; //D } }A. A B. B C. C D. D
- 12.下列程序中注释的哪两个代码（A，B，C，D）是错误的（无法通过编译）？class Father { private int money =12; float height; int seeMoney(){ return money ; //A } }class Son extends Father { int height; int lookMoney() { int m = seeMoney(); //B return m; }}class E { public static void main(String args[]) { Son erzi = new Son(); erzi.money = 300; //C erzi.height = 1.78F; //D }} 选项：A处错误|B处错误|C处错误|D处错误
- 13.A,B,C,D标注行哪行有错误？abstract class A{ abstract int get（）；}class People { int computer（A a）{ return a.get（）; }}class Exc{ public static void main（String[] args){ People p = new People（）； int m=p.computer（new A（）{ int m=100； //A static int n=10； //B public int get（）{ //C return 100+m； //D } }）； System.out.println（m）； }}选项： A:A; B:B; C:C; D:D
- 14.//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 E{ 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】 }}
- 15. 下列代码的输出结果是（ ）interface Com{ int computer(int a,int b);}class A implements Com{ public int computer(int a, int b){return a+b; }}class B implements Com{ public int computer(int a, int b){ return a*b; }}class C{ int a,b; public C(int a, int b){ this.a=a; this.b=b; } int fun(Com com){ return com.computer(a,b); }}public class E{ public static void main(String arsg[]){ C obj=new C(10,2); int m=obj.fun(new A()); int n=obj.fun(new B()); System.out.printf("%d:%d",m,n); }}
- 16.以下哪个方法不可以加入类 Son？ （ ） Class Father{ Public void methodOne(int i){} Public void methodTwo(int i){} Public static void methodTree(int i){} Public static void methodFour(int i){} } Class Son extends Father{…} 选项： A: public static void methodOne(int i){} B: public void methodTwo(int i){} C: public static void methodTree(int i, int j){} D: public static void methodFour(int i){}
- 17.以下哪个方法不可以加入类Son? ( )class Father{ public void methodOne(int i){} public void methodTwo(int i){} public static void methodTree(int i){} public static void methodFour(int i){}}class Son extends Father{…} 选项：A、public static void methodOne(int i){} B、public void methodTwo(int i){} C、public static void methodTree(int i, int j){} D、public static void methodFour(int i){}
- 18.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】 }}}
- 19.找出下面代码中存在的错误。public class Test { public static void main(String[] args) { m(new GraduateStudent()); m(new Student()); m(new Person()); m(new Object()); } public static void m(Student x) { System.out.println(x.toString()); }}class GraduateStudent extends Student {}class Student extends Person { @Override public String toString() { return "Student"; }}class Person extends Object { @Override public String toString() { return "Person"; }}
