Given:
1.public class TestFive {
2.private int x;
3.public void foo() {
4.int current = x;
5.x = current + 1;
6.}
7.public void go() {
8.for(int i = 0; i < 5; i++) {
9.new Thread() {
10.public void run() {
11.foo();
12.System.out.print(x + ", ");
13.} }.start();
14.} }
Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ? (Choose two.)

• A. move the line 12 print statement into the foo() method
• B. wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }
• C. change the variable declaration on line 2 to private volatile int x;
• D. change line 7 to public synchronized void go() {
• E. wrap the code inside the foo() method with a synchronized( this ) block

Given:
1.class TestException extends Exception { }
2.class A {
3.public String sayHello(String name) throws TestException {
4.if(name == null) throw new TestException();
5.return "Hello " + name;
6.}
7.}
8.public class TestA {
9.public static void main(String[] args) {
10.new A().sayHello("Aiko");
11.}
12.}
Which statement is true?

• A. TestA compiles if line 10 is enclosed in a try/catch block that catches TestException.
• B. The method declared on line 9 cannot be modified to throw TestException.
• C. Compilation succeeds.
• D. Class A does not compile.

A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class? (Choose three.)

• A. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.
• B. The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
• C. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java
• D. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java.
• E. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.java
• F. The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..
• G. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.

Given:
1.public class Boxer1{
2.Integer i;
3.int x;
4.public Boxer1(int y) {
5.x = i+y;
6.System.out.println(x);
7.}
8.public static void main(String[] args) {
9.new Boxer1(new Integer(4));
10.}
11.}
What is the result?

• A. The value "4" is printed at the command line.
• B. An IllegalStateException occurs at runtime.
• C. Compilation fails because of an error in line 5.
• D. Compilation fails because of an error in line 9.
• E. A NumberFormatException occurs at runtime.
• F. A NullPointerException occurs at runtime.