单选题1. public class Test {  2. int x= 12;  3. public void method(int x) {  4. x+=x;  5. System.out.println(x);  6. }  7. }  Given:  34. Test t = new Test();  35. t.method(5);  What is the output from line 5 of the Test class?()A5B10C12D17E24

题目
单选题
1. public class Test {  2. int x= 12;  3. public void method(int x) {  4. x+=x;  5. System.out.println(x);  6. }  7. }  Given:  34. Test t = new Test();  35. t.method(5);  What is the output from line 5 of the Test class?()
A

 5

B

 10

C

 12

D

 17

E

 24


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更多“单选题1. public class Test {  2. int x= 12;  3. public void method(int x) {  4. x+=x;  5. System.out.println(x);  6. }  7. }  Given:  34. Test t = new Test();  35. t.method(5);  What is the output from line 5 of the Test class?()A  5B  10C  12D  17E  24”相关问题
  • 第1题:

    在下列源代码文件Test.java中, ( )是正确的类定义。

    A.public class test{

    B.public class Test{ public int x=0;public int x=0; public test (intx) public Test (int x){ {this.x=x; this.x=x;} }} }

    C.public class Test extends T1,T2{

    D.protected class Test extends T2{ public int=0;public int x=0; public Test(int x){Public Test (int x){ this.x=x;this.x=x: }} }}


    正确答案:B

  • 第2题:

    在下列源代码文件Test.java中,哪个选项是正确的类定义? ( )

    A.public class test { public int x=0; public test(int x) { this.x=x; } }

    B.public class Test { public int x=0; public Test(int x) { this.x=x; } }

    C.public class Test extends Ti,T2 { public int x=0; public Test(int x) { this.x=x; } }

    D.protected class Test extends T2 { public int x=0; public Test(int x) { this.x=x; } }


    正确答案:B

  • 第3题:

    以下程序调试结果为:

    public class Test {

    int m=5;

    public void some(int x) {

    m=x;

    }

    public static void main(String args []) {

    new Demo().some(7);

    }

    }

    class Demo extends Test {

    int m=8;

    public void some(int x) {

    super.some(x);

    System.out.println(m);

    }

    }

    A.5

    B.8

    C.7

    D.无任何输出

    E.编译错误


    正确答案:B

  • 第4题:

    1. public class Exception Test {  2. class TestException extends Exception {}  3. public void runTest() throws TestException {}  4. public void test() /* Point X */ {  5. runTest();  6. }  7. }  At Point X on line 4, which code is necessary to make the code compile?()  

    • A、 No code is necessary.
    • B、 throws Exception
    • C、 catch ( Exception e )
    • D、 throws RuntimeException
    • E、 catch ( TestException e)

    正确答案:B

  • 第5题:

    1. public class Test {  2. public  T findLarger(T x, T y) {  3. if(x.compareTo(y) > 0) {  4. return x;  5. } else {  6. return y;  7. }  8. }  9. }  and:  22. Test t = new Test();  23. // insert code here  Which two will compile without errors when inserted at line 23?()

    • A、 Object x = t.findLarger(123, “456”);
    • B、 int x = t.findLarger(123, new Double(456));
    • C、 int x = t.findLarger(123, new Integer(456));
    • D、 int x = (int) t.findLarger(new Double(123), new Double(456));

    正确答案:A,C

  • 第6题:

    1. public class Test {  2. int x= 12;  3. public void method(int x) {  4. x+=x;  5. System.out.println(x);  6. }  7. }  Given:  34. Test t = new Test();  35. t.method(5);  What is the output from line 5 of the Test class?() 

    • A、 5
    • B、 10
    • C、 12
    • D、 17
    • E、 24

    正确答案:B

  • 第7题:

    1. interface TestA { String toString(); }  2. public class Test {  3. public static void main(String[] args) {  4. System.out.println(new TestA() {  5. public String toString() { return “test”; }  6. }  7. }  8. }  What is the result?() 

    • A、 test
    • B、 null
    • C、 An exception is thrown at runtime.
    • D、 Compilation fails because of an error in line 1.
    • E、 Compilation fails because of an error in line 4.
    • F、 Compilation fails because of an error in line 5.

    正确答案:A

  • 第8题:

    1. class Bar { }  1. class Test {  2. Bar doBar() {  3. Bar b = new Bar();  4. return b;  5. }  6. public static void main (String args[]) {  7. Test t = new Test();  8. Bar newBar = t.doBar();  9. System.out.println(“newBar”);  10. newBar = new Bar();  11. System.out.println(“finishing”);  12. }  13. } At what point is the Bar object, created on line 3, eligible for garbage collection?()  

    • A、 After line 8.
    • B、 After line 10.
    • C、 After line 4, when doBar() completes.
    • D、 After line 11, when main() completes.

    正确答案:B

  • 第9题:

    多选题
    1. public class Test {  2. public  T findLarger(T x, T y) {  3. if(x.compareTo(y) > 0) {  4. return x;  5. } else {  6. return y;  7. }  8. }  9. }  and:  22. Test t = new Test();  23. // insert code here  Which two will compile without errors when inserted at line 23?()
    A

    Object x = t.findLarger(123, “456”);

    B

    int x = t.findLarger(123, new Double(456));

    C

    int x = t.findLarger(123, new Integer(456));

    D

    int x = (int) t.findLarger(new Double(123), new Double(456));


    正确答案: A,D
    解析: 暂无解析

  • 第10题:

    单选题
    1. public class Test {  2. int x= 12;  3. public void method(int x) {  4. x+=x;  5. System.out.println(x);  6. }  7. }  Given:  34. Test t = new Test();  35. t.method(5);  What is the output from line 5 of the Test class?()
    A

     5

    B

     10

    C

     12

    D

     17

    E

     24


    正确答案: B
    解析: 暂无解析

  • 第11题:

    单选题
    1. interface TestA { String toString(); }  2. public class Test {  3. public static void main(String[] args) {  4. System.out.println(new TestA() {  5. public String toString() { return “test”; }  6. }  7. }  8. }  What is the result?()
    A

     test

    B

     null

    C

     An exception is thrown at runtime.

    D

     Compilation fails because of an error in line 1.

    E

     Compilation fails because of an error in line 4.

    F

     Compilation fails because of an error in line 5.


    正确答案: A
    解析: 暂无解析

  • 第12题:

    单选题
    1.public class Test{ 2.int x=12; 3.public void method(intx){ 4.x+=x; 5.System.out.println(x); 6.} 7.} Given: 34.Test t=new Test(); 35.t.method(5); What is the output from line 5 of the Test class?()
    A

    5

    B

    10

    C

    12

    D

    17

    E

    24


    正确答案: D
    解析: 暂无解析

  • 第13题:

    在下列源代码文件Test.java中,哪个选项是正确的类定义?

    A.public class test{ public int x=0; public test(int x ) { this.x=x; } }

    B.public class Test { public int x=0; public Test(int x ) { this.x=x; } }

    C.public class Test extends T1 T2 { public int x=0; public Test(int x){ this.x=x; } }

    D.protected class Test extends T2 { public int x=0; public Test(int x) { this.x=x; } }


    正确答案:B
    解析:类声明格式为[修饰符]class类名[extends父类名][implements类实现的接口列表],选项A)中源文件名与程序名不相同,Java不支持多重继承所以选项C)错误,选项D)中类的访问权限不对应为public。

  • 第14题:

    以下代码的输出结果?public class Test{int x=5;public static void main(String argv[]){Test t=new Test();t.x++;change(t);System.out.println(t.x);}static void change(Test m){m.x+=2;}}

    A. 7

    B. 6

    C. 5

    D. 8


    正确答案:D

  • 第15题:

    package test1;  public class Test1 {  static int x = 42;  }  package test2;  public class Test2 extends test1.Test1 {  public static void main(String[] args) { System.out.println(“x = “ + x);  }  }  What is the result?() 

    • A、 x = 0
    • B、 x = 42
    • C、 Compilation fails because of an error in line 2 of class Test2.
    • D、 Compilation fails because of an error in line 3 of class Test1.
    • E、 Compilation fails because of an error in line 4 of class Test2.

    正确答案:C

  • 第16题:

    1.public class Test{ 2.int x=12; 3.public void method(intx){ 4.x+=x; 5.System.out.println(x); 6.} 7.} Given: 34.Test t=new Test(); 35.t.method(5); What is the output from line 5 of the Test class?()

    • A、5
    • B、10
    • C、12
    • D、17
    • E、24

    正确答案:B

  • 第17题:

    1. interface foo {  2. int k = 0;  3. } 4.    5. public class test implements Foo (  6. public static void main(String args[]) (  7. int i;  8. Test test = new test ();  9. i= test.k;  10.i= Test.k;  11.i= Foo.k;  12.)  13.)  14.        What is the result?()  

    • A、 Compilation succeeds.
    • B、 An error at line 2 causes compilation to fail.
    • C、 An error at line 9 causes compilation to fail.
    • D、 An error at line 10 causes compilation to fail.
    • E、 An error at line 11 causes compilation to fail.

    正确答案:A

  • 第18题:

    Given the following code:    public class Test {  void printValue(int m){  do {  System.out.println("The value is"+m);     }  while( --m > 10 )     }  public static void main(String arg[]) {     int i=10;  Test t= new Test();     t.printValue(i);     }     }  Which will be output?()    

    • A、 The value is 8
    • B、 The value is 9
    • C、 The value is 10
    • D、 The value is 11

    正确答案:C

  • 第19题:

    Consider the following class:     class Test(int i) {     void test(int i) {  System.out.println(“I am an int.”); }    void test(String s) {   System.out.println(“I am a string.”);     }          public static void main(String args) {    Test t=new Test();     char ch=“y”;    t.test(ch);     }      }     Which of the statements below is true?()

    • A、 Line 5 will not compile, because void methods cannot be overridden.
    • B、 Line 12 will not compile, because there is no version of test() that rakes a charargument.
    • C、 The code will compile but will throw an exception at line 12.
    • D、 The code will compile and produce the following output: I am an int.
    • E、 The code will compile and produce the following output: I am a String.

    正确答案:D

  • 第20题:

    1. public class A {  2. public String doit(int x, int y) {  3. return “a”;  4. }  5.  6. public String doit(int... vals) {  7. return “b”;  8. } 9. }  Given:  25. A a=new A();  26. System.out.println(a.doit(4, 5));  What is the result?() 

    • A、 Line 26 prints “a” to System.out.
    • B、 Line 26 prints „b” to System.out.
    • C、 An exception is thrown at line 26 at runtime.
    • D、 Compilation of class A will fail due to an error in line 6.

    正确答案:A

  • 第21题:

    单选题
    1. public class Exception Test {  2. class TestException extends Exception {}  3. public void runTest() throws TestException {}  4. public void test() /* Point X */ {  5. runTest();  6. }  7. }  At Point X on line 4, which code is necessary to make the code compile?()
    A

     No code is necessary.

    B

     throws Exception

    C

     catch ( Exception e )

    D

     throws RuntimeException

    E

     catch ( TestException e)


    正确答案: E
    解析: 暂无解析

  • 第22题:

    单选题
    package test1;  public class Test1 {  static int x = 42;  }  package test2;  public class Test2 extends test1.Test1 {  public static void main(String[] args) { System.out.println(“x = “ + x);  }  }  What is the result?()
    A

     x = 0

    B

     x = 42

    C

     Compilation fails because of an error in line 2 of class Test2.

    D

     Compilation fails because of an error in line 3 of class Test1.

    E

     Compilation fails because of an error in line 4 of class Test2.


    正确答案: E
    解析: 暂无解析

  • 第23题:

    单选题
    Consider the following class:     class Test(int i) {     void test(int i) {  System.out.println(“I am an int.”); }    void test(String s) {   System.out.println(“I am a string.”);     }          public static void main(String args) {    Test t=new Test();     char ch=“y”;    t.test(ch);     }      }     Which of the statements below is true?()
    A

     Line 5 will not compile, because void methods cannot be overridden.

    B

     Line 12 will not compile, because there is no version of test() that rakes a charargument.

    C

     The code will compile but will throw an exception at line 12.

    D

     The code will compile and produce the following output: I am an int.

    E

     The code will compile and produce the following output: I am a String.


    正确答案: D
    解析: 在第12行,16位长的char型变量ch在编译时会自动转化为一个32位长的int型,并在运行时传给void test(int i)方法。

  • 第24题:

    单选题
    1. interface foo {  2. int k = 0;  3. } 4.    5. public class test implements Foo (  6. public static void main(String args[]) (  7. int i;  8. Test test = new test ();  9. i= test.k;  10.i= Test.k;  11.i= Foo.k;  12.)  13.)  14.        What is the result?()
    A

     Compilation succeeds.

    B

     An error at line 2 causes compilation to fail.

    C

     An error at line 9 causes compilation to fail.

    D

     An error at line 10 causes compilation to fail.

    E

     An error at line 11 causes compilation to fail.


    正确答案: A
    解析: 暂无解析