單項(xiàng)選擇題

public class Test {  
public 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.printIn(i);  
}  
}  
What is the result? () 

A. 2
B. 4
C. 8
D. 16
E. The code will not compile.

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單項(xiàng)選擇題

public class X implements Runnable(  
 private int x;  
private int y; 
 public static void main(Stringargs) 
X that = new X();  
(new Thread(that)).start(); 
(new Thread(that)).start(); 
) 
public void run() ( 
for (;;) ( 
x++;  
y++;  
System.out.printIn(“x=” + x + “, y = ” + y);  
)  
)  
What is the result?()  

A. Errors at lines 7 and 8 cause compilation to fail.
B. The program prints pairs of values for x and y that might not always be the same on the same line  (for example, “x=2, y=1”).
C. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by  “x=1, y=1”).
D. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears only for once (for example, “x=1, y=1”  followed by “x=2, y=2”).

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