(完整版)大学期末考试Java题库

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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 Li

2、nkedList(); linkedlist.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

3、.addFirst(First); linkedlist.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 (

4、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(); 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 =

5、1) int i = 0; int j = 4 / i; catch (ArithmeticException e) System.out.println(Catch ); catch (Exception e) System.out.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 vo

6、id 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.toLowerCase(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

7、 (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（ true,false）。 public class StringTest public static void main(String args) String s1 = new

8、 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 BufferedReader buf = new BufferedReader( new InputStreamReader(Syste

9、m.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(new Integer(10); set.add(new Intege

10、r(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; public int step

11、; 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; cla

12、ss B extends A int x=10, 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.pr

13、int(defaultt); case 0: System.out.print(zerot); i+; break; 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

14、 main(String args) Example example = new Example(); example.change(example.str, example.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 publi

15、c 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); publi

16、c 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.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

17、(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 extends 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

18、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（ ） 。 public 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)

19、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 Example extends TT public static void main(String args) Example example = new Example(); public E

20、xample(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 (int j = 0; j 4; j+) for (int k = 0; k 5; k+) +count; if (i = 1 & j = 2 &

21、 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(String args) A a = new A(); D

22、og 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 Bu

23、fferedWriter(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) retu

24、rn (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 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 Strin

25、g 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.out.println(a1.Show(c); System.out.println(a1.Show(d); System.out.println(a2.Show(b); System.out.p

26、rintln(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); 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);

27、 System.out.println(b0=+b0); 25. 下面程序的运行结果是（ ） 。 public class 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); 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 Aclas

28、s void go() System.out.println(Bclass); public static void main(String args) Aclass a = new Aclass(); 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(); linke

29、dlist.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(4,current); linkedlist.addFirst(First

30、); linkedlist.addLast(Last); System.out.println(After adding elements，the linkedlist is: ); System.out.println(linkedlist); 27. 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(); i

31、nt 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 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

32、, 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+) resume: 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

33、.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.out.print(c); default: System.out.print(!); 31. 下面程序的运行结果是（ ） 。 clas

34、s 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 and C); public String Show(B obj) return (C and

35、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.out.println(a1.Show(

36、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 static void m

37、ain(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

38、的运行结果是（ ） 。 public class 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); publ

39、ic class Example extends TT public static 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() Sys

40、tem.out.println(Hello); public static void main(String 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

41、, 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.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 ma

42、in(String args) throws IOException File inputFile = new File(a.txt); File outputFile = new File(b.txt); 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。 imp

43、ort 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); linkedlist.add(new Integer(5); System.out.println

44、(The original contents of the linkedlist is: ); System.out.println(linkedlist); linkedlist.add(2,hello); linkedlist.addFirst(First); linkedlist.addLast(Last); System.out.println(After adding elements，the linkedlist is: ); System.out.println(linkedlist); linkedlist.removeLast(); linkedlist.set(1,one)

45、; 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 java.util.*; public class ArrayListExample public static void main(String args) ArrayList arraylist = new ArrayList(); arraylist.add(A); arraylist.ad

46、d(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.println(The original size of the arraylist is: + arraylist.size(); arraylist.add(2,A); arraylist.add(4,new Integer(5); System.out.print

47、ln(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.println(After deleting elements，the arraylist is: + arraylist); System.out.println(The size of the arraylist is: + arrayl

48、ist.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 Test public static void main(String args) Point a = new Point(); Point b = new Point(1,1

49、); 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.println(m); 45. 下面程序的运行结果是（ ） 。 import java.util.*; public class test pu

50、blic 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() System.out.println(DDDDD); public void showMessageAboutLoc

51、al() 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); public void showInnerMessage() System.out.print

52、ln(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 SimpleEventHandling extends JFrame impleme

53、nts 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(this); container.add(text)

54、; 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); public static void main(String args) SimpleEventHandling seh=new SimpleEventHandling(); seh.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);