1Z0-501 試験問題を無料オンラインアクセス

Exhibit:
1 . public class X implements Runnable (
2 .private int x;
3 .private int y;
4 .
5 .public static void main(String [] args) (
6 .X that = new X();
7 .(new Thread(that)) . start( );
8 .(new Thread(that)) . start( );
9 .)
1 0.
1 1. public synchronized void run( ) (
1 2.for (;;) (
1 3.x++;
1 4.y++;
1 5.System.out.printIn("x = " + x
1 6.)
1 7.)
1 8. )
What is the result?
+ ", y = " + y);

• A.The program prints pairs of values for x and y that are always the same on the same line (forexample, "x=1, y=1". In addition, each value appears twice (for example, "x=1, y=1" followed by"x=1, y=1")
• B.An error at line 11 causes compilation to fail.
• C.The program prints pairs of values for x and y that are always the same on the same line (forexample, "x=1, y=1". In addition, each value appears twice (for example, "x=1, y=1" followed by"x=2s, y=2")
• D.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")
• E.Errors at lines 7 and 8 cause compilation to fail.

Which two CANNOT directly cause a thread to stop executing? (Choose Two)

• A.Calling the wait method on an object.
• B.Calling the notify method on an object.
• C.Calling the start method on another Thread object.
• D.Calling the notifyAll method on an object.
• E.Calling the yield method.

Given:
1 . public class Foo {
2 . public static void main (String []args) {
3 . int i = 1;
4 . int j = i++;
5 . if ((i>++j) && (i++ ==j)){
6 .i +=j;
7 .}
8 .}
9 .}
What is the final value of i?

• A.1
• B.3
• C.4
• D.5
• E.2

Given:
1. public class foo {
2 . static String s;
3 . public static void main (String[]args) {
4 . system.out.printIn ("s=" + s);
5 . }
6 . }
What is the result?

• A.The code does not compile because string s is not initialized.
• B.The code compiles, but a NullPointerException is thrown when toString is called.
• C.The code compiles and "s=" is printed.
• D.The code does not compile because string s cannot be referenced.
• E.The code compiles and "s=null" is printed.

Exhibit:
1 . class super (
2 . public int I = 0;
3 .
4 . public super (string text) (
5 . I = 1
6 .)
7 .)
8 .
9 . public class sub extends super (
1 0. public sub (string text) (
1 1. i= 2
1 2. )
1 3.
1 4. public static void main (straing args[]) (
1 5. sub sub = new sub ("Hello");
1 6. system.out. PrintIn(sub.i);
1 7.)
1 8. )
What is the result?

• A.Compilation will succeed and the program will print "0"
• B.Compilation will succeed and the program will print "2"
• C.Compilation will succeed and the program will print "1"
• D.Compilation will fail.