1Z0-853 試験問題を無料オンラインアクセス

Given:
10.
abstract public class Employee {
11.
protected abstract double getSalesAmount();
12.
public double getCommision() {
13.
return getSalesAmount() * 0.15;
14.
}
15.
}
16.
class Sales extends Employee {
17.
// insert method here
18.
}
Which two methods, inserted independently at line 17, correctly complete the Sales class? (Choose two.)

• A.protected double getSalesAmount() { return 1230.45; }
• B.double getSalesAmount() { return 1230.45; }
• C.private double getSalesAmount() { return 1230.45; }
• D.public double getSalesAmount() { return 1230.45; }

Given:
11.
public class Person {
12.
private name;
13.
public Person(String name) {
14.
this.name = name;
15.
}
16.
public int hashCode() {
17.
return 420;
18.
}
19.
}
Which statement is true?

• A.The time to find the value from HashMap with a Person key depends on the size of the map.
• B.Deleting a Person key from a HashMap will delete all map entries for all keys of type Person.
• C.Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate.
• D.The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.

Given a correctly compiled class whose source code is:
1.package com.sun.sjcp;
2.public class Commander {
3.public static void main(String[] args) {
4.// more code here
5.}
6.}
Assume that the class file is located in /foo/com/sun/sjcp/, the current directory is /foo/, and that the classpath contains "." (current directory).
Which command line correctly runs Commander?

• A.java com/sun/sjcp/Commander
• B.java com.sun.sjcp.Commander
• C.java Commander
• D.java -cp com.sun.sjcp Commander
• E.java -cp com/sun/sjcp Commander

Given classes defined in two different files:
1.package util;
2.public class BitUtils {
3.private static void process(byte[] b) {}
4.}
1.package app;
2.public class SomeApp {
3.public static void main(String[] args) {
4.byte[] bytes = new byte[256];
5.// insert code here
6.}
7.}
What is required at line 5 in class SomeApp to use the process method of BitUtils?

• A.app.BitUtils.process(bytes);
• B.util.BitUtils.process(bytes);
• C.SomeApp cannot use the process method in BitUtils.
• D.process(bytes);
• E.BitUtils.process(bytes);
• F.import util.BitUtils.*; process(bytes);

Which two code fragments will execute the method doStuff() in a separate thread? (Choose two.)

• A.new Thread() {
  public void run() { doStuff(); }
  }.start();
• B.new Thread(new Runnable() {
  public void run() { doStuff(); }
  }).run();
• C.new Thread() {
  public void start() { doStuff(); }
  };
• D.new Thread(new Runnable() {
  public void run() { doStuff(); }
  }).start();
• E.new Thread() { public void run() { doStuff(); } };
• F.new Thread() {
  public void start() { doStuff(); }
  }.run();