JAVA题库:格林模拟试题一（上）(2)
添加时间: 2007-9-22 8:25:53 作者: JAVA认证考试 阅读次数:176 来源: http://www.d9soft.com
Question 14)
Which of the following lines of code will compile without error
1)
int i=0;if(i) { System.out.println("Hello"); }2)
boolean b=true;boolean b2=true;if(b==b2) { System.out.println("So true"); }3)
int i=1;int j=2;if(i==1 j==2) System.out.println("OK");4)
int i=1;int j=2;if(i==1 & j==2) System.out.println("OK");Question 15)
What will be output if you try to compile and run the following code, but there is no file called Hello.txt in the current directory?.
import java.io.*;public class Mine { public static void main(String argv[]){ Mine m=new Mine(); System.out.println(m.amethod()); } public int amethod() { try { FileInputStream dis=new FileInputStream("Hello.txt"); }catch (FileNotFoundException fne) { System.out.println("No such file found"); return -1; }catch(IOException ioe) { } finally{ System.out.println("Doing finally"); } return 0; }}1) No such file found
2 No such file found ,-1
3) No such file found, Doing finally, -1
4) 0
Question 16)
Which of the following statements are true?
1) Methods cannot be overriden to be more private
2) static methods cannot be overloaded
3) private methods cannot be overloaded
4) An overloaded method cannot throw exceptions not checked in the base class
Question 17)
What will happen if you attempt to compile and run the following code?
class Base {}class Sub extends Base {}class Sub2 extends Base {}public class CEx{ public static void main(String argv[]){ Base b=new Base(); Sub s=(Sub) b; }}1) Compile and run without error
2) Compile time Exception
3) Runtime Exception
Question 18)
Which of the following statements are true?
1) System.out.println( -1 >>> 2);will output a result larger than 10
2) System.out.println( -1 >>> 2); will output a positive number
3) System.out.println( 2 >> 1); will output the number 1
4) System.out.println( 1 <<< 2); will output the number
Question 19)
What will happen when you attempt to compile and run the following code?
public class Tux extends Thread{ static String sName = "vandeleur"; public static void main(String argv[]){ Tux t = new Tux(); t.piggy(sName); System.out.println(sName); } public void piggy(String sName){ sName = sName + " wiggy"; start(); } public void run(){ for(int i=0;i < 4; i++){ sName = sName + " " + i; } }}
1) Compile time error
2) Compilation and output of "vandeleur wiggy"
3) Compilation and output of "vandeleur wiggy 0 1 2 3"
4) Compilation and output of either "vandeleur", "vandeleur 0", "vandeleur 0 1" "vandaleur 0 1 2" or "vandaleur 0 1 2 3"
Question 20)
What will be displayed when you attempt to compile and run the following code
//Code startimport java.awt.*;public class Butt extends Frame{ public static void main(String argv[]){ Butt MyBut=new Butt(); } Butt(){ Button HelloBut=new Button("Hello"); Button ByeBut=new Button("Bye"); add(HelloBut); add(ByeBut); setSize(300,300); setVisible(true); }}//Code end1) Two buttons side by side occupying all of the frame, Hello on the left and Bye on the right
2) One button occupying the entire frame saying Hello
3) One button occupying the entire frame saying Bye
4) Two buttons at the top of the frame one saying Hello the other saying Bye
Question 21)
What will be output by the following code?
public class MyFor{ public static void main(String argv[]){ int i; int j; outer: for (i=1;i <3;i++) inner: for(j=1; j<3; j++) { if (j==2) continue outer; System.out.println("Value for i=" + i + " Value for j=" +j); } }}1) Value for i=1 Value for j=1
2) Value for i=2 Value for j=1
3) Value for i=2 Value for j=2
4) Value for i=3 Value for j=1
Question 24)
Which of the following will output -4.0
1) System.out.println(Math.floor(-4.7));
2) System.out.println(Math.round(-4.7));
3) System.out.println(Math.ceil(-4.7));
4) System.out.println(Math.min(-4.7));
Question 25)
What will happen if you attempt to compile and run the following code?
Integer ten=new Integer(10);Long nine=new Long (9);System.out.println(ten + nine);int i=1;System.out.println(i + ten);1) 19 followed by 20
2) 19 followed by 11
3) Compile time error
4) 10 followed by 1
Question 26)
If you run the code below, what gets printed out?
String s=new String("Bicycle");int iBegin=1;char iEnd=3;System.out.println(s.substring(iBegin,iEnd));1) Bic
2) ic
3) icy
4) error: no method matching substring(int,char)
Question 27)
If you wanted to find out where the position of the letter v (ie return 2) in the string s containing " Java ",which of the following could you use?
1) mid(2,s);
2) charAt(2);
3) s.indexOf('v');
4) indexOf(s,'v');
Question 28)
Given the following declarations
String s1=new String("Hello")String s2=new String("there");String s3=new String();Which of the following are legal operations?
1) s3=s1 + s2;
2) s3=s1-s2;
3) s3=s1 & s2;
4) s3=s1 && s2
Question 29)
What is the result of the following operation?
System.out.println(4 3);
1) 6
2) 0
3) 1
4) 7
Question 30)
public class MyClass1 {public static void main(String argv[]){ }/*Modifier at XX */ class MyInner {}}What modifiers would be legal at XX in the above code?
1) public
2) private
3) static
4) friend
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