JAVA双语教学考试试卷及答案A.docx

班 级 学 号 姓 名 密封装订线 密封装订线 密封装订线A卷注意事项：请将各题答案按编号顺序填写到答题卷上，答在试卷上无效。一、单项选择题（120每小题1分，2130每小题2分，共40分）1. Which are keywords in Java?A. NullB. TRUEC. sizeofD. implements2. 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)3. Which statement of assigning a long type variable to a hexadecimal value is correct? A. long number = 345L; B. long number = 0345;C. long number = 0345L; D. long number = 0x345L;4. Which layout manager is used when the frame is resized the buttonss position in the Frame might be changed? A. BorderLayout B. FlowLayoutC. CardLayoutD. GridLayout 5. Which are not Java primitive types? A. shortB. BooleanC. byteD. float 6. Given the following code:if (x0) System.out.println(first); else if (x-3) System.out.println(second); else System.out.println(third); Which range of x value would print the string second? A. x 0B. x -3C. x = -3D. x -3 7. Given the following code:public class Personint arr = new int10;public static void main(String a) System.out.println(arr1);Which statement is correct?A. When compilation some error will occur.B. It is correct when compilation but will cause error when running.C. The output is zero.D. The output is null.8. Short answer:The decimal value of i is 13, the octal i value is: A. 14B. 015C. 0x14D. 0129. A public member vairable called MAX_LENGTH which is int type, the value of the variable remains constant value 100. Use a short statement to define the variable.A. public int MAX_LENGTH=100;B. final int MAX_LENGTH=100;C. final public int MAX_LENGTH=100;D. public final int MAX_LENGTH=100.10. Which correctly create an array of five empty Strings?A. String a = , , , , , ;B. String a 5;C. String 5 a; D. String a = new String5; for (int i = 0; i 4)System.out.println(Test A);else if(val 9)System.out.println(Test B);else System.out.println(Test C);Which values of val will result in Test C being printed:A. val 920. Which of the following are valid definitions of an applications main ( ) method?A. public static void main( );B. public static void main( String args );C. public static void main( String args );D. public static void main( Graphics g );21. After the declaration:char c = new char100;what is the value of c50?A. 50B. C. u0032D. u000022. Which of the following statements assigns Hello Java to the String variable s ?A. String s = Hello Java;B. String s = Hello Java;C. new String s = Hello Java;D. String s = new String (Hello Java);23. If arr contains only positive integer values, what does this function do?public int guessWhat(int arr)int x = 0;for(int i = 0; i arr.length; i+)x = x arri ? arri : x;return x;A. Returns the index of the highest element in the arrayB. Returns true/false if there are any elements that repeat in the arrayC. Returns how many even numbers are in the arrayD. Returns the highest element in the array24. Which of the following are legal declarations of a twodimensional array of integers?A. int55 a = new int;B. int a = new int5,5;C. int a = new int 55;D. inta = new 5int5;25. If val = 1 in the code below:switch (val)case 1: System.out.print(P);case 2:case 3: System.out.print (Q) ;break;case 4: System.out.print(R);default: System.out.print (S);A. PB. PQC. QSD. PQRS26. Given the following code:1. public class Test 2. int m, n;3. public Test() 4. public Test(int a) m=a; 5. public static void main(String arg) 6. Test t1,t2;7. int j,k;8. j=0; k=0;9. t1=new Test();10. t2=new Test(j,k);11. 12. Which line would cause one error during compilation?A. line 3B. line 5C. line 6D. line 1027. For the code:m = 0;while( +m 2 )System.out.println(m);Which of the following are printed to standard output?A. 0B. 1C. 2D. 328. Consider the following code: What will happen when you try to compile it?public class InnerClasspublic static void main(Stringargs)public class MyInner A. It will compile fine.B. It will not compile, because you cannot have a public inner class.C. It will compile fine, but you cannot add any methods, because then it will fail to compile.D. It will compile fail.29. What is the result of executing the following code:public class Test public static void main(String args) String word = restructure; System.out.println(word.substring(2, 5); A. restB. esC. strD. st30. What will be written to the standard output when the following program is run? public class Test public static void main(String args) System.out.println(9 2); A. 11B. 7C. 18D. 0 31. When call fact(3), What is the result?int fact(int n) if(n=1) return 1; else return n*fact(n-1); A. 2B. 6C. 3D. 0 32. What is the result of executing the following code:String s=new String(abcdefg);for(int i=0;is.length();i+=2) System.out.print(s.charAt(i); A. acegB. bdfC. abcdefgD. abcd33. What is the result of executing the following code:publicclassTestpublicstaticvoidchangeStr(Stringstr)str=welcome;publicstaticvoidmain(Stringargs)Stringstr=12345;changeStr(str);System.out.println(str);Pleasewritetheoutputresult：A. welcomeB. 12345C. welcome12345D. 12345welcome34. What is the result of executing the following code:1.publicclassTest2.staticbooleanfoo(charc)3.System.out.print(c);4.returntrue;5.6.publicstaticvoidmain(Stringargv)7. inti=0;8. for(foo(A);foo(B)&(i2);foo(C)9. i+;10. foo(D);12.13. 14.Whatistheresult?A.ABDCBDCBB.ABCDABCDC.Compilationfails.D.Anexceptionisthrownatruntime.35. What will happen when you attempt to compile and run the following code?public final class Test4 class Inner void test() if (Test4.this.flag); else sample(); private boolean flag=false; public void sample() System.out.println(Sample); public Test4() (new Inner().test(); public static void main(String args) new Test4(); What is the result: A. Print out “Sample” B. Program produces no output but termiantes correctly. C. Program does not terminate. D. The program will not compile 36. What is the result of executing the following fragment of code:class Base Base() amethod(); int i = 100; public void amethod() System.out.println(Base.amethod(); public class Derived extends Base int i = -1; public static void main(String argv) Base b = new Derived(); System.out.println(b.i); b.amethod(); public void amethod() System.out.println(Derived.amethod(); A. Derived.amethod()B. Derived.amethod() -1100 Derived.amethod()Derived.amethod()C. 100D. Compile time error Derived.amethod()37. What is the result of executing the following code:public class Test String s1=menu; public static void main(String args) int z=2; Test t=new Test(); System.out.println(t.s1+z); A. menu2B. 2C. 2menuD. menu38. What is the result of executing the following code:public class Test implements A int x=5; public static void main(String args) Test c1 = new Test(); System.out.println(c1.x+A.k); interface A int k= 10;A. 5B. 10C. 15D. 10539. What is the result of executing the following code:import java.util.Arrays;public class Test public static void main(String unused) String str = xxx, zzz,yyy,aaa; Arrays.sort(str); int index=Arrays.binarySearch(str,zzz); if(index=-1) System.out.println(no); else System.out.println(yes); A. noB. xxxC. 0D. yes40. What is the result of executing the following code:int b=2, 3, 4, 5, 6, 7, 8; int sum=0; for(int i=0;ib.length;i+) for(int j=0;jbi.length;j+) sum+=bij; System.out.println(sum=+sum);A. 9B. 11C. 15D. 35 41. What is the result of executing the following code:public class Test static void leftshift(int i, int j) i=j; public static void main(String args) int i=4, j=2; leftshift(i,j); System.out.println(i); A. 2B. 4C. 8D. 1642. What is the result of executing the following code:public class Test int x=2; int y; public static void main(String args) int z=3; Test t=new Test(); System.out.println(t.x+t.y+z); A. 5B. 23C. 2D. 3 43. What is the result of executing the following fragment of code: boolean flag = false;if (flag = true) System.out.println(true); else System.out.println(false);A. trueB. falseC. An exception is raisedD. Nothing happens44. In the following applet, how many buttons will be displayed? import java.applet.*; import java.awt.*; public class Q16 extends Applet Button okButton = new Button(Ok); public void init() add(okButton); add(okButton); add(okButton); add(new Button(Cancel); add(new Button(Cancel); add(new Button(Cancel); add(new Button(Cancel); setSize(300,300); A. 1 Button with label Ok and 1 Button with label Cancel.B. 1 Button with label Ok and 4 Buttons with label Cancel.C. 3 Buttons with label Ok and 1 Button with label Cancel.D. 4 Buttons with label Ok and 4 Buttons with label Cancel.45. What is the result of executing the following code:1. class StaticStuff 2. static int x = 10;3.static x += 5; 4. public static void main(String args)5. System.out.println(x = + x);6. 7. static x /= 5; 8. A. x = 10B. x = 15C. x = 3D. x=546. What will appear in the standard output when you run the Tester class? class Tester int var; Tester(double var) this.var = (int)var; Tester(int var) this(hello); Tester(String s) this(); System.out.println(s); Tester() System.out.println(good-bye); public static void main(String args) Tester t = new Tester(5); A. helloB. good-bye C. hello followed by good-byeD good-bye followed by hello47. What letters are written to the standard output with the following code? class Unchecked public static void main(String args) try method(); catch(Exception e) static void method() try wrench(); System.out.println(a); catch(ArithmeticException e) System.out.println(b); finally System.out.println(c); System.out.println(d); static void wrench() throw new NullPointerException(); Select all valid answers.A. aB. bC. cD. d48. Given this code snippet：try tryThis();return; catch(IOException x1) System.out.println(exception 1);return; catch(Exception x2) System.out.println(exception 2);return; finally System.out.println(finally);what will appear in the standard output if tryThis() throws a IOException?A. exception 1 followed by finallyB. exception 2 followed by finallyC. exception 1 D. exception 2二、填空题(每空1分，共10分) 1. JVM指的是Java【1】。2. Java中的字符变量在内存中占【2】位（bit）。3. Java语言对简单数据类型进行了类包装，int对应的包装类是【3】。4. 继承性是面向对象方法的一个基本特征，它使代码可【4】5. 抽象类中含有没有实现的方法，该类不能【5】。6. 在Java的输入输出流中，数据从数据源流向数据目的地，流的传送是【6】行的。7. 若类声明时加上修饰符 final ，则表示该类不能有【7】。8. Java的类库中提供Throwable类来描述异常，它有Error 和【8】两个直接子类。9. 类中的某些方法通过类名就可以直接被调用，例如JOptionPane.showMessage Dialog(null,”按确定键退出”)中的showMessageDialog 方法，这种方法称为【9】。10. Java 的线程调度策略是一种基于优先级的【10】式调度。三、写出下面程序的功能或运行结果(每小题4分，共20分)1. 下面程序的功能是什么？public class Exam1 public static void main(String args) for(int i=1; i10; i+) for(int j=1; j=i; j+) System.out.print(j + * + i + = + j*i + ); if(j*i10)System.out.print( ); System.out.println(); 2. 下面程序的功能是什么？public class Exam2 public static void main(String args) int x = 2, y = 1, t; double sum = 0; for(int i=1; i=15; i+) sum = sum + (double)x/y; t = y; y = x; x = y + t; System.out.println(Sum= + sum);3. 下面程序的功能是什么？import java.util.*;public class lianxi29 public static void main(String args) Scanner s = new Scanner(System.in); int a = new int33;System.out.println(请输入9个整数：); for(int i=0; i3; i+) for(int j=0; j3; j+) aij = s.nextInt(); System.out.println(