Oracle Java Certified Programmer : 1Z0-501

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Oracle Java Certified Programmer Sample Questions:

1. Which determines if "prefs" is a directory and exists on the file system?

A) Boolean exists=(new Directory("prefs")).exists();
B) Boolean exists=Directory.exists ("prefs");
C) Boolean exists=(new File("prefs")).isDir();
D) Boolean exists=(new File("prefs")).isDirectory();
E) Boolean exists=true;
Try{
Directory d = new Directory("prefs");
}
catch (FileNotFoundException e) {
exists = false;
}

2. Which type of event indicates a key pressed on a java.awt.Component?

A) KeyPressEvent
B) KeyTypedEvent
C) KeyDownEvent
D) KeyPressedEvent
E) KeyEvent

3. Exhibit:
ClassOne.java
1. package com.abc.pkg1;
2. public class ClassOne {
3. private char var = 'a';
4. char getVar() {return var;}
5. } ClassTest.java
1 . package com.abc.pkg2;
2 . import com.abc.pkg1.ClassOne;
3 . public class ClassTest extends ClassOne {
4 . public static void main(String[]args){
5 .char a = new ClassOne().getVar();
6 .char b = new ClassTest().getVar();
7 .}
8 . }
What is the result?

A) Compilation succeeds but an exception is thrown at line 5 in ClassTest.java.
B) Compilation succeeds and no exceptions are thrown.
C) Compilation succeeds but an exception is thrown at line 6 in ClassTest.java.
D) Compilation will fail.

4. Given:
1 . public class Test {
2 . public static void main (String []args){
3 . unsigned byte b = 0;
4 . b--;
5 .
6 .}
7 . }
What is the value of b at line 5?

A) 255
B) Compilation will succeed but the program will throw an exception at line 4.
C) -1
D) 127
E) Compilation will fail.

5. Exhibit:
1 . public class Test {
2 . public static void replaceJ(string text) {
3 . text.replace ('j', 'l');
4 .}
5 .
6 . public static void main(String args[]){
7 . string text = new String ("java")
8 . replaceJ(text);
9 . system.out.printIn(text);
1 0.}
1 1.}
What is the result?

A) The program prints "java"
B) Compilation succeeds but the program throws an exception.
C) An error at line 7 causes compilation to fail.
D) The program prints "lava"

Solutions: