10年JAVA模拟试题A.doc

10年JAVA模拟试题A一、单项选择题（135每小题1分，3650每小题2分，共65分）1. Java虚拟机（JVM）在运行JAVA代码时，不会进行的操作是A）加载代码 B）校验代码 C）编译代码 D）执行代码2. JAVA程序的并发机制是A）多线程 B）多接口 C）多平台 D）多态性3. 在方法内部使用，代表对当前对象自身引用的关键字是A）super B)This D)Super D)this4. 对鼠标点击按钮操作进行事件处理的接口是A）MouseListener B）WindowsListener C）ActionListener D）KeyListener5. AWT中用来表示颜色的类是A）Font B）Color C)Panel D)Dialog6. Java中属于跳转语句的是A）try B）catch C）finally D）break7. 下面说法哪个是正确的( ) A）Applet可以访问本地文件 B）对static方法的调用需要类实例 C）socket类在java.lang中D）127.0.0.1地址代表本机8. 下列哪个方法可用于创建一个可运行的类( ) A）public class X implements Runable public void run(). B）public class X implements Thread public void run(). C）public class X implements Thread public int run(). D）public class X implements Runable protected void run().9. Java编程所必须的默认引用包为( ) A）java.sys包 B）java.lang包 C）java.new包 D）以上都不是 10. Java Applet源程序文件的扩展名为( )。A）.java B）.class C）.html D）.exe11. 设a = 3，则表达式(-a) = 3; B）s3 = x; C）int i = s.length; D）String t = For + s;36. What is written to the standard output given the following statement:System.out.println(4&7); 100Select the right answer: 111A）4B）5C）6D）7 37. What is written to the standard output given the following statement:System.out.println(7|9);Select the right answer:A）0B）7C）9D）1538. Consider the following code:Integer s = new Integer(9);Integer t = new Integer(9);Long u = new Long(9);Which test would return true?A）(s.equals(new Integer(9) B）(s.equals(9)C）(s=u) D）(s=t)39. What should you use to position a Button within an application frame so that the width of the Button is affected by the Frame size but the height is not affected.A）FlowLayout B）GridLayoutC）Center area of a BorderLayout D）North or South of a BorderLayout40. If this source code is contained in a file called SmallProg.java, what command should be used to compile it using the JDK?public class SmallProg public static void main(String args) System.out.println(Good luck!); A）java SmallProg B）javac SmallProgC）java SmallProg.java D）javac SmallProg.java41. Which statement about listener is true?A）Most component unallow multiple listeners to be added.B）If multiple listener be add to a single component, the event only affected one listener.C）Component dont allow multiple listeners to be add.D）The listener mechanism allows you to call an addXxxxListener method as many times as is needed, specifying as many different listeners as your design require.42. What will be the result when you run the following code?class Aclassvoid go()System.out.println(Aclass);public class Bclass extends Aclassvoid goSystem.out.println(Bclass);public static void main(String args)Aclass a=new Aclass();Aclass a1=new Bclass();a.go();a1.go();The output is： A）Aclass B）Bclass C）Aclass D）BclassAclass Bclass Bclass Aclass43. 已知有下列类的说明，则下列哪个语句是正确的？public class Test private float f = 1.0f;int m = 12;static int n=1;public static void main(String arg)Test t = new Test( );A）t.f； B）this.n； C）Test.m； D）Test.f；44. 给定下面的代码片段：1) String str = null;2) if (str != null) & (str.length() 10) 3) System.out.println(more than 10);4) 5) else if (str != null) & (str.length() 5) 6) System.out.println(less than 5);7) 8) else System.out.println(end); 哪一行会导致错误？ A）line 1 B）line 2 C）line 5 D）line 845. 对于下列代码：public class Parent public int addValue( int a, int b) int s;s = a+b;return s;class Child extends Parent 下述哪个方法可以加入Child类中实现多态? A）int addValue( int a, int b )/ do something. B）public void addValue (int a, int b )/ do something. C）public int addValue( int a )/ do something. D）public int addValue( int a, int b ) /do something.46. 下列语句序列执行后，k的值是( )。int i=10, j=18, k=30;switch( j - i ) case 8 : k+;case 9 : k+=2;case 10: k+=3;default : k/=j;A）31 B）32 C）2 D）3347. Given the following class definition:class Aprotected int i;A(int i)this.i=i;which of the following would be a valid inner class for this class?A）class B B）class B extends A C）class B extends A D）class B B()System.out.println(“i=” + i); class A 48. Give the following java class:public class Examplestatic int x=new int15;public static void main(String args)System.out.println(x5);Which statement is corrected?A）When compile, some error will occur. B）When run, some error will occur.C）Output is zero. D）Output is null.49. What will be the result of attempting to compile and run the following code?abstract class MineBase abstract void amethod(); static int i;public class Mine extends MineBase public static void main(String args) int ar = new int5; for(i=0; iar.length; i+) System.out.println(ari); A）a sequence of 5 0s will be printed B）Error: ar is used before it is initializedC）Error Mine must be declared abstract D）IndexOutOfBoundes Error50. class Line public static class Point class Triangle / insert code hereWhich code, inserted at line 15, creates an instance of the Point class defined in Line?A. Point p = new Point();B. Line.Point p = new Line.Point();C. The Point class cannot be instatiated at line 15.D. Line 1 = new Line() ; 1.Point p = new 1.Point();二、写出下列程序完成的功能(每小题5分，共20分)1、public class Sumpublic static void main( String args ) int sum = 0 ; for ( int i = 1 ; i = 100 ; i + + ) sum += i ; System.out.println( “sum=”+sum ); 2、import java.io.* ;public class Reversepublic static void main(String args ) int i , n =10 ; int a = new int10; for ( i = 0 ; i = 0 ; i- ) System.out.print(ai+ ); System.out.println( ); 3、import java.awt.*;public class AppOut public static void main(String args) new FrameOut(); class FrameOut extends Frame Label prompt; FrameOut() super(西南交通大学); prompt=new Label(西南交通大学欢迎您); setLayout(new FlowLayout(); add(prompt); setSize(300,200); show( ); 4、import java.io.*;public class abc public static void main(String args) SubClass sb = new SubClass( ); System.out.println(sb.max( ); class SuperClass int a = 10 , b = 20 ; class SubClass extends SuperClass int max( ) return (ab)?a:b); 三、写出下面程序的运行结果(每小题5分，共15分)1、import java.io.*;public class abc public static void main(String args) String s1 = Hello!; String s2 = new String(I a