SCJP试题－SCJPMockExam4

Question 1) 
1) float f=1.3;  
3) byte b=257;  
5) int i=10; 

Question 2) 

public class MyClass { 
amethod(arguments); 
public void amethod(String arguments) { 
System.out.println(arguments[1]); 
} 
2) error method main not correct  
4) amethod must be declared with String 

Answer to Question 2 

Question 3) 

1) 

import java.awt.*; 
class Myclass {} 

package MyPackage; 
class MyClass{} 

/*This is a comment */

package MyPackage; 
class MyClass{}

Answer to Question 3 

Question 4) 

1) -128 to 127  
3) -255 to 256  

Answer to Question 4 

Question 5) 

java myprog good morning 
public static void main(String argv) 
System.out.println(argv) 
} 
2) good  
4) Exception raised: "java.lang.ArrayIndexOutOfBoundsException: 2" 

Question 6) 

1) if  
3) goto  
5) case 

Answer to Question 6 

Question 7) 

1) 2variable  
3) _whatavariable  
5) $anothervar  

Answer to Question 7 

Question 8) 

static int i; 
System.out.println(i); 
} 
2) null  
4) 0 

Answer to Question 8 

Question 9) 

public class Q { 
int anar=new int{1,2,3}; 
} 
1) 1  
3) 2  

Question 10)

What will happen if you try to compile and run the following code? 

public class Q { 
int anar=new int; 
} 
1) Error: anar is referenced before it is initialized  
3) 0  

Answer to Question 10 

Question 11)

What will be the result of attempting to compile and run the following code? 

abstract class MineBase { 
static int i; 
public class Mine extends MineBase { 
int ar=new int; 
System.out.println(ar[i]); 
} 
2) Error: ar is used before it is initialized  
4) IndexOutOfBoundes Error 

Answer to Question 11  

Question 12) 

int i=1; 
case 0: 
break; 
System.out.println("one"); 
System.out.println("two"); 
System.out.println("default"); 
1) one  
3) one, two, default  

Answer to Question 12 

Question 13) 

int i=9; 
default: 
case 0: 
break; 
System.out.println("one"); 
System.out.println("two"); 
1) default  
3) error default clause not defined  

Answer to Question 13 

Question 14) 

1) 

int i=0; 
System.out.println("Hello"); 
2) 

boolean b=true; 
if(b==b2) { 
} 

int i=1; 
if(i==1|| j==2) 
4) 

int i=1; 
if(i==1 &| j==2)

System.out.println("OK"); 

Question 15) 
no file called Hello.txt in the current directory?. 

import java.io.*; 
public static void main(String argv){ 
System.out.println(m.amethod()); 
public int amethod() { 
FileInputStream dis=new FileInputStream("Hello.txt"); 
System.out.println("No such file found"); 
}catch(IOException ioe) { 
System.out.println("Doing finally"); 

return 0; 

} 
2 No such file found ,-1  
4) 0 

Answer to Question 15 

Question 16) 

1) Methods cannot be overriden to be more private 
3) Private methods cannot be overloaded 

Answer to Question 16 

Question 17) 

class Base {} 
class Sub2 extends Base {} 
public static void main(String argv){ 
Sub s=(Sub) b; 
} 
2) Compile time Exception  

Question 18) 

1) System.out.println( -1 >>> 2);will output a result larger than 10 
>> 2); will output a positive number  
> 1); will output the number 1  
4) System.out.println( 1