Oracle 1z0-851 Exam Practice Questions (P. 3)

Given:
01. public class Rainbow {
02. public enum MyColor {
03. RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff);
04. private final int rgb;
05. MyColor(int rgb) { this.rgb = rgb; }
06. public int getRGB() { return rgb; }
07. };
08. public static void main(String[] args) {
09. //insert code here
10. }
11. }
Which code fragment, inserted at line 9, allows the Rainbow class to compile?

Given:
01. public class Mud {
02. //insert code here
03. System.out.println("hi");
04. }
05. }
And the following five fragments:
public static void main(String...a) {
public static void main(String.* a) {
public static void main(String... a) {
public static void main(String[]... a) {
public static void main(String...[] a) {
How many of the code fragments, inserted independently at line 2, compile?

Given:
class Atom {
Atom() { System.out.print("atom "); }
}
class Rock extends Atom {
Rock(String type) { System.out.print(type); }
}
public class Mountain extends Rock {
Mountain() {
super("granite ");
new Rock("granite ");
}
public static void main(String[] a) { new Mountain(); }
}
What is the result?

Given:
01. interface TestA { String toString(); }
02.
03. public class Test {
04. public static void main(String[] args) {
05. System.out.println(new TestA() {
06. public String toString() { return "test"; }
07. });
08. }
09. }
What is the result?

Given:
public static void parse(String str) {
try {
float f = Float.parseFloat(str);
} catch (NumberFormatException nfe) {
f = 0;
} finally {
System.out.println(f);
}
}
public static void main(String[] args) {
parse("invalid");
}
What is the result?