(最新)大学期末考试Java题库.pdf

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1、1.下面程序的运行结果是（）。public class E3 public static void main(String args)String s=大大;char a=s.charAt(2),b=s.charAt(4);System.out.print(a);System.out.println(b);2.下面程序的运行结果是（）。import java.util.*;public class LinkedListExample public static void main(String args)LinkedList linkedlist=new LinkedList();linked

2、list.add(new Integer(1);linkedlist.add(new Integer(2);linkedlist.add(new Integer(3);linkedlist.add(new Integer(4);linkedlist.add(new Integer(5);System.out.println(The original contents of the linkedlist is:);System.out.println(linkedlist);linkedlist.add(2,hello);linkedlist.addFirst(First);linkedlist

3、.addLast(Last);System.out.println(After adding elements，the linkedlist is:);System.out.println(linkedlist);答：3.下面程序的运行结果是（）。public class TestArray public static void main(String args)int i,j;int a=5,9,6,8,7;for(i=0;i a.length-1;i+)int k=i;for(j=i;j a.length;j+)if(aj ak)k=j;int temp=ai;ai=ak;ak=temp;

4、for(i=0;i a.length;i+)System.out.print(ai+);System.out.println();4.下面程序的运行结果是（）。public class TryCatchFinally static void Proc(int sel)try if(sel=0)System.out.println(no Exception);return;else if(sel=1)int i=0;int j=4/i;catch(ArithmeticException e)System.out.println(Catch);catch(Exception e)System.ou

5、t.println(Will not be executed);finally System.out.println(finally);public static void main(String args)Proc(0);Proc(1);5.下面程序的运行结果是（）。public class welcomeTest public static void main(String args)String s,s1=;char c;s=wELCOME;for(int i=0;i=a&c=z)s1=s1+Character.toUpperCase(c);else s1=s1+Character.to

6、LowerCase(c);System.out.println(s1);6.下面程序的运行结果是（）。public class arrTest public static void main(String args)int i,j;int a=2,1,4,8;for(i=0;i a.length-1;i+)int k=i;for(j=i;j a.length;j+)if(aj ak)k=j;int temp=ai;ai=ak;ak=temp;for(i=0;i a.length;i+)System.out.print(ai+);System.out.println();7.下面程序的运行结果是

7、（true,false）。public class StringTest public static void main(String args)String s1=new String(abcde);String s2=new String(abcde);boolean b1=s1.equals(s2);boolean b2=s1=s2;System.out.print(b1+,+b2);8.下面程序运行时，若输入10，则输出结果是（）。public class test public static void main(String args)throws IOException Buffe

8、redReader buf=new BufferedReader(new InputStreamReader(System.in);while(true)String str=buf.readLine();if(str.equals(quit)break;int x=Integer.parseInt(str);System.out.println(x*x);System.out.println(“OK”);9.下面程序的运行结果是（）。public class T public static void main(String args)Set set=new HashSet();set.add

9、(new Integer(10);set.add(new Integer(5);set.add(new Integer(15);set.add(new Integer(5);set.add(new Integer(10);System.out.println(size=+set.size();Iterator it=set.iterator();while(it.hasNext()System.out.print(it.next()+);10.下面程序的运行结果是（）。public class A class Dog private String name;private int age;pu

10、blic int step;Dog(String s,int a)name=s;age=a;step=0;public void run(Dog fast)fast.step+;public static void main(String args)A a=new A();Dog dog=a.new Dog(Tom,3);dog.step=25;dog.run(dog);System.out.println(dog.step);11.下面程序的运行结果是（）。class A int x=1,y=2;double add()return x+y;class B extends A int x=1

11、0,y=20;double add()return super.x+super.y;class Takecare public static void main(String args)A a=new A();B b=new B();System.out.println(a.add=+a.add();System.out.println(b.add=+b.add();12.下面程序的运行结果是（）。for(int i=0;i 5;i+)switch(i)default:System.out.print(defaultt);case 0:System.out.print(zerot);i+;br

12、eak;case 1:System.out.print(onet);case 2:System.out.print(twot);i+;13.下面程序的运行结果是（）。public class Example String str=new String(good);char ch=a,b,c;public void change(String str,char ch)str=test ok;ch0=g;public static void main(String args)Example example=new Example();example.change(example.str,examp

13、le.ch);System.out.print(example.str+and);System.out.print(example.ch);14.下面程序的运行结果是（）。class A public String Show(D obj)return(A and D);public String Show(A obj)return(A and A);class B extends A public String Show(B obj)return(B and B);public String Show(A obj)return(B and A);class C extends B public

14、 String Show(C obj)return(C and C);public String Show(B obj)return(C and B);class D extends B public String Show(D obj)return(D and D);public String Show(B obj)return(D and B);public class main public static void main(String args)A a1=new A();A a2=new B();B b=new B();C c=new C();D d=new D();System.o

15、ut.println(a1.Show(b);System.out.println(a1.Show(c);System.out.println(a1.Show(d);System.out.println(a2.Show(b);System.out.println(a2.Show(c);System.out.println(a2.Show(d);System.out.println(b.Show(b);System.out.println(b.Show(c);System.out.println(b.Show(d);15.下面程序的运行结果是（）。public class Example exte

16、nds TT public static void main(String args)Example t=new Example(Tom);public Example(String s)super(s);System.out.println(How do you do?);public Example()this(I am Tom);class TT public TT()System.out.println(What a pleasure!);public TT(String s)this();System.out.println(I am +s);16.下面程序的运行结果是（）。publ

17、ic class Example public static void main(String args)for(int i=0;i 2;i+)resume:for(int j=0;j 3;j+)for(int k=0;k A)y=爱;z=情;else y=我;z=她;System.out.println(+x+y+z);19.下面程序的运行结果是（）。class TT public TT()System.out.println(What a peasure!);public TT(String s)this();System.out.println(I am +s);public class

18、 Example extends TT public static void main(String args)Example example=new Example();public Example(String s)super(s);System.out.println(How do youo do?);public Example()this(I am Tom);20.下面程序的运行结果是（）。public class Example public static void main(String args)int count=0;for(int i=0;i 3;i+)resume:for

19、(int j=0;j 4;j+)for(int k=0;k 5;k+)+count;if(i=1&j=2&k=3)break resume;System.out.println(tcount=+count);21.下面程序的运行结果是（）。public class A class Dog private String name;private int age;public int step;Dog(String s,int a)name=s;age=a;step=0;public void run(Dog fast)fast.step-;public static void main(Stri

20、ng args)A a=new A();Dog dog=a.new Dog(Tom,3);dog.step=30;dog.run(dog);System.out.println(dog.step);22.下面程序的运行结果是（）。import java.io.*;public class TestFile public static void main(String args)throws Exception BufferedReader br=new BufferedReader(new InputStreamReader(System.in);BufferedWriter bw=new B

21、ufferedWriter(new FileWriter(input.txt);String s;while(true)System.out.print(请输入一个字符串：);System.out.flush();s=br.readLine();if(s.length()=0)break;bw.write(s);bw.newLine();bw.close();23.下面程序的运行结果是（）。class A public String Show(D obj)return(A and D);public String Show(A obj)return(A and A);class B exten

22、ds A public String Show(B obj)return(B and B);public String Show(A obj)return(B and A);class C extends B public String Show(C obj)return(C and C);public String Show(B obj)return(C and B);class D extends B public String Show(D obj)return(D and D);public String Show(B obj)return(D and B);public class

23、main public static void main(String args)A a1=new A();A a2=new B();B b=new B();C c=new C();D d=new D();System.out.println(a1.Show(b);System.out.println(a1.Show(c);System.out.println(a1.Show(d);System.out.println(a2.Show(b);System.out.println(a2.Show(c);System.out.println(a2.Show(d);System.out.printl

24、n(b.Show(b);System.out.println(b.Show(c);System.out.println(b.Show(d);24.下面程序的运行结果是（）。public class E public static void main(String args)long a=1,2,3,4;long b=100,200,300,400,500;b=a;System.out.println(数组 b 的长度:+b.length);System.out.println(b0=+b0);25.下面程序的运行结果是（）。public class E3 public static void

25、main(String args)String s=西安石油大学;char a=s.charAt(2),b=s.charAt(4);System.out.print(a);System.out.println(b);1.1.说出下列程序的输出结果。class Aclass void go()System.out.println(Aclass);public class Bclass extends Aclass void go()System.out.println(Bclass);public static void main(String args)Aclass a=new Aclass(

26、);Aclass a1=new Bclass();a.go();a1.go();26.下面程序的运行结果是（）。import java.util.*;public class LinkedListExample public static void main(String args)LinkedList linkedlist=new LinkedList();linkedlist.add(new Integer(1);linkedlist.add(new Integer(2);linkedlist.add(new Integer(3);linkedlist.add(new Integer(4)

27、;linkedlist.add(new Integer(5);System.out.println(The original contents of the linkedlist is:);System.out.println(linkedlist);linkedlist.add(4,current);linkedlist.addFirst(First);linkedlist.addLast(Last);System.out.println(After adding elements，the linkedlist is:);System.out.println(linkedlist);27.下

28、面程序的运行结果是（）。class A public int f(int x)return x+1;class B extends A public int f(int x)return x*x;public class E public static void main(String args)A a=new B();int m=a.f(10);System.out.println(m);28.下面程序的运行结果是（）。public class A class Dog private String name;private int age;public int step;Dog(String

29、 s,int a)name=s;age=a;step=5;public void run(Dog fast)fast.step+;public static void main(String args)A a=new A();Dog dog=a.new Dog(Tom,6);dog.step=48;dog.run(dog);System.out.println(dog.step);29.下面程序的运行结果是（）。public class Example public static void main(String args)int count=0;for(int i=0;i 3;i+)resu

30、me:for(int j=0;j 2;j+)for(int k=0;k 4;k+)+count;if(i=2&j=1&k=3)break resume;System.out.println(tcount=+count);30.下面程序的运行结果是（）。public class E3 public static void main(String args)char c=0;for(int i=1;i=4;i+)switch(i)case 1:c=b;System.out.print(c);case 2:c=e;System.out.print(c);break;case 3:c=p;System

31、.out.print(c);default:System.out.print(!);31.下面程序的运行结果是（）。class A public String Show(D obj)return(A and D);public String Show(A obj)return(A and A);class B extends A public String Show(B obj)return(B and B);public String Show(A obj)return(B and A);class C extends B public String Show(C obj)return(C

32、and C);public String Show(B obj)return(C and B);class D extends B public String Show(D obj)return(D and D);public String Show(B obj)return(D and B);public class main public static void main(String args)A a1=new A();A a2=new B();B b=new B();C c=new C();D d=new D();System.out.println(a1.Show(b);System

33、.out.println(a1.Show(c);System.out.println(a1.Show(d);System.out.println(a2.Show(b);System.out.println(a2.Show(c);System.out.println(a2.Show(d);System.out.println(b.Show(b);System.out.println(b.Show(c);System.out.println(b.Show(d);32.下面程序的运行结果是（）。import java.util.*;public class TestList public stati

34、c void main(String args)List list=new LinkedList();print(list);list.add(C);print(list);list.add(D);print(list);for(int i=0;i 4;i+)list.add(E);print(list);static void print(List list)System.out.println(list=+list);System.out.print(list.size=+list.size();System.out.println(n);33.下面程序的运行结果是（）。public cl

35、ass E3 public static void main(String args)String s=西安石油大学;char a=s.charAt(2),b=s.charAt(4);System.out.print(a);System.out.println(b);34.下面程序的运行结果是（）。class TT public TT()System.out.println(What a peasure!);public TT(String s)this();System.out.println(I am +s);public class Example extends TT public s

36、tatic void main(String args)Example example=new Example();public Example(String s)super(s);System.out.println(How do you do?);public Example()this(I am Tom);35.下面程序的运行结果是（）。public class Test static System.out.println(Hi there);public void print()System.out.println(Hello);public static void main(Stri

37、ng args)Test st1=new Test();st1.print();Test st2=new Test();st2.print();36.下面程序的运行结果是（）。class A void operate(int c)int i;for(i=0;ic.length;i+)ci=3*ci;class Takecare public static void main(String args)A a=new A();int b=1,2,3,4;a.operate(b);for(int i=0;ib)?a:b);39.如果 test.dat文件不存在,下面这段程序：import java.

38、io.*;class TestIO public static void main(String args)tryFile raf=new File(test.dat,r);catch(IOException e)System.out.println(IO Exception);运行结果：_。40.import java.io.*;public class C public static void main(String args)throws IOException File inputFile=new File(a.txt);File outputFile=new File(b.txt);

39、FileReader in=new FileReader(inputFile);FileWriter out=new FileWriter(outputFile);int c;while(c=in.read()!=-1)out.write(c);in.close();out.close();程序的功能是：_。41.阅读程序，写出程序运行结果。import java.util.*;public class LinkedListExample public static void main(String args)LinkedList linkedlist=new LinkedList();lin

40、kedlist.add(new Integer(1);linkedlist.add(new Integer(2);linkedlist.add(new Integer(3);linkedlist.add(new Integer(4);linkedlist.add(new Integer(5);System.out.println(The original contents of the linkedlist is:);System.out.println(linkedlist);linkedlist.add(2,hello);linkedlist.addFirst(First);linkedl

41、ist.addLast(Last);System.out.println(After adding elements，the linkedlist is:);System.out.println(linkedlist);linkedlist.removeLast();linkedlist.set(1,one);System.out.println(After deleting and changing,the linkedlist is:);System.out.println(linkedlist);System.out.println();42.阅读程序，写出程序运行结果。import j

42、ava.util.*;public class ArrayListExample public static void main(String args)ArrayList arraylist=new ArrayList();arraylist.add(A);arraylist.add(B);arraylist.add(C);arraylist.add(D);arraylist.add(E);arraylist.add(F);System.out.println(The original contents of the arraylist is:+arraylist);System.out.p

43、rintln(The original size of the arraylist is:+arraylist.size();arraylist.add(2,A);arraylist.add(4,new Integer(5);System.out.println(After adding elements，the arraylist is:+arraylist);System.out.println(The size of the arraylist is:+arraylist.size();arraylist.remove(E);arraylist.remove(1);System.out.

44、println(After deleting elements，the arraylist is:+arraylist);System.out.println(The size of the arraylist is:+arraylist.size();System.out.println();43.下面程序的运行结果是（）。x=-1y=-1 x=1y=1 class Point int x,y;Point()this(-1,-1);Point(int a,int b)x=a;y=b;void showxy()System.out.println(x=+x+y=+y);public class

45、 Test public static void main(String args)Point a=new Point();Point b=new Point(1,1);a.showxy();b.showxy();44.下面程序的运行结果是（）。class A public int f(int x)return x+1;class B extends A public int f(int x)return x*x;public class E public static void main(String args)A a=new B();int m=a.f(10);System.out.pri

46、ntln(m);45.下面程序的运行结果是（）。import java.util.*;public class test public static void main(String args)int a=23,67,89,90,-987;double b=12.89,90.87,34,678.987,-98.78,0.89;Arrays.sort(a);for(int i=0;i=4;i+)System.out.print(ai+,);46.阅读程序，写出程序运行结果。public class LocalClassExample public LocalClassExample()Syste

47、m.out.println(DDDDD);public void showMessageAboutLocal()class LocalClass public LocalClass()System.out.println(CCCCC);public void showLocalMessage()System.out.println(BBBBB);LocalClass lc=new LocalClass();lc.showLocalMessage();public class InnerClass public InnerClass()System.out.println(FFFFF);publ

48、ic void showInnerMessage()System.out.println(GGGGG);public static void main(String args)LocalClassExample lce=new LocalClassExample();lce.showMessageAboutLocal();47.阅读下面程序，说出程序实现的主要功能。包括定义了什么样的组件，怎样实现了事件处理，事件处理做了什么。import javax.swing.*;import java.awt.*;import java.awt.event.*;public class SimpleEve

49、ntHandling extends JFrame implements ActionListener JTextField text;JButton colorButton;Container container;public SimpleEventHandling()super(简单示例);container=getContentPane();container.setLayout(new FlowLayout();text=new JTextField(选择示例文字);colorButton=new JButton(选择);colorButton.addActionListener(th

50、is);container.add(text);container.add(colorButton);pack();setVisible(true);public void actionPerformed(ActionEvent e)if(e.getSource()=colorButton)Color colorstyle=Color.black;colorstyle=JColorChooser.showDialog(this,选择,colorstyle);text.setForeground(colorstyle);colorButton.setForeground(colorstyle);