Free Oracle 1Z0-851 Exam Dumps Questions & Answers

Given a method that must ensure that its parameter is not null:
11.public void someMethod(Object value) {
12.// check for null value ...
20.System.out.println(value.getClass());
21.}
What, inserted at line 12, is the appropriate way to handle a null value?

• A.  assert value == null;
• B.  assert value != null, "value is null";
• C.  if (value == null) {
  throw new IllegalArgumentException("value is null");
  }
• D.  if (value == null) {
  throw new AssertionException("value is null");
  }

Given:
2.public class Hi {
3.void m1() { }
4.protected void() m2 { }
5.}
6.class Lois extends Hi {
7.// insert code here
8.}
Which four code fragments, inserted independently at line 7, will compile? (Choose four.)

• A.  private void m2() { }
• B.  void m2() { }
• C.  private void m1() { }
• D.  protected void m1() { }
• E.  protected void m2() { }
• F.  public void m2() { }
• G.  public void m1() { }

Given:
1.public class Breaker2 {
2.static String o = "";
3.public static void main(String[] args) {
4.z:
5.for(int x = 2; x < 7; x++) {
6.if(x==3) continue;
7.if(x==5) break z;
8.o = o + x;
9.}
10.System.out.println(o);
11.}
12.}
What is the result?

• A.  234
• B.  2346
• C.  Compilation fails.
• D.  246
• E.  2
• F.  24

Given classes defined in two different files:
1.package util;
2.public class BitUtils {
3.public static void process(byte[] b) { /* more code here */ }
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.  util.BitUtils.process(bytes);
• B.  process(bytes);
• C.  SomeApp cannot use methods in BitUtils.
• D.  BitUtils.process(bytes);
• E.  import util.BitUtils.*; process(bytes);

Given:
11.public void testIfA() {
12.if (testIfB("True")) {
13.System.out.println("True");
14.} else {
15.System.out.println("Not true");
16.}
17.}
18.public Boolean testIfB(String str) {
19.return Boolean.valueOf(str);
20.}
What is the result when method testIfA is invoked?

• A.  Not true
• B.  Compilation fails because of an error at line 12.
• C.  An exception is thrown at runtime.
• D.  True
• E.  Compilation fails because of an error at line 19.