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Java选择题40道全英文带答案 PDF 下载
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1、 Read the following program:
public class test {
public static void main(String [] args) {
int x = 3;
int y = 1;
if (x = y)
System.out.println("Not equal");
else
System.out.println("Equal");
}
}
What is the result?
A.The output is equal
B. The output in not Equal
C. An error at " if (x = y)" causes compilation to fall
D. The program executes but no output is show on console.
Answer: C
2、Which of the following lines will compile without warning or error.
A .float f=1.3;
B.char c="a";
C.byte b=257;
D.int i=10;
Answer：D
3、What will happen if you try to compile and run the following code
public class MyClass {
public static void main(String arguments[]) {
amethod(arguments);
}
public void amethod(String[] arguments) {
System.out.println(arguments);
System.out.println(arguments[1]);
}
}
A.error Can't make static reference to void amethod.
B. error method main not correct
C. error array must include parameter
D.amethod must be declared with String
Answer：A
4、Which of the following will compile without error
A.import java.awt.*;
package Mypackage;
class Myclass {}
B.package MyPackage;
import java.awt.*;
class MyClass{}
C.package MyPackage;
import java.awt.*;
class MyClass{}
Answer：C
5、A byte can be of what size
A. -128 to 127
B. (-2 power 8 )-1 to 2 power 8
C. -255 to 256
D.depends on the particular implementation of the Java Virtual machine
Answer：A
6、What will be printed out if this code is run with the following command line? public class myprog{
public static void main(String argv[]) {
System.out.println(argv[2]);
}
}
A. myprog
B. good
C. morning
D. Exception raised: "java.lang.ArrayIndexOutOfBoundsException: 2"
Answer：D
7、What will happen when you compile and run the following code?
public class MyClass{
static int i;
public static void main(String argv[]){
System.out.println(i);
}
}
A. Error Variable i may not have been initialized
B. null
C. 1
D. 0
Answer：D
8、Which of the following lines will compile without warning or error.
A .float f=1.3;
B.char c="a";
C.byte b=257;
D.int i=10;
Answer：D
9、What will happen if you try to compile and run the following code?
Public class Q{
Public static void main(String arg[]){
Int anar[] = new int[5];
System.out.println(anar[0]);
}
}
A.Error:anar is referenced before itt is initialized
B.Null
C.0
D.5
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