1Z0-850 試験問題を無料オンラインアクセス

Which package contains the classes used to create a socket?

• A.java.util
• B.java.io
• C.java.lang
• D.java.net
• E.java.awt
• F.javax.swing

You need to create a class that maintains a customer's account balance. The class must allow both credits (deposits) and debits (withdrawals) to the account.
Which class correctly implements this functionality?

• A.public class Account {
  double balance;
  public void debit(double amount) {
  amount = balance - amount;
  }
  public void credit(double amount) {
  amount = balance + amount;
  }
• B.public class Account {
  double balance;
  balance = balance - amount;
  }
  public void credit(double amount) {
  double balance;
  balance = balance + amount;
  }
• C.public class Account {
  double balance;
  public void debit() {
  double debit;
  balance = balance - debit;
  }
  public void credit() {
  double credit
  balance = balance + credit;
  }
• D.public class Account {
  double balance;
  public void debit(double amount) {
  balance = balance - amount;
  }
  public void credit(double amount) {
  balance = balance + amount;
  }
• E.public class Account {
  public void debit(double amount) {
  double balance;
  balance = balance - amount;
  }
  public void credit(double amount) {
  double balance;
  balance = balance + amount;
  }

Which two are true? (Choose two.)

• A.J2EE includes servlet APIs and EJB APIs.
• B.J2EE includes the MIDP API.
• C.J2EE applications depend on web servers.
• D.J2EE runs on consumer and embedded devices.
• E.J2EE application developers need J2SE.

Which type of primitive can be assigned a new value within a conditional expression?

• A.boolean
• B.byte
• C.char
• D.int
• E.short

Given:
1 . class Test2 {
2 . static String setMessage(String str) {
3 . return str + "How are you doing?";
4 . }
5 .
6 . public static void main(String[] args) {
7 . String str = "Hello! ";
8 . str = setMessage(str);
9 . System.out.println("str : " + str);
1 0. }
1 1. }
What is the result?

• A.str : Hello!
• B.Compilation fails because of an error at line 3.
• C.Compilation fails because of an error at line 7.
• D.Compilation fails because of an error at line 8.
• E.Compilation fails because of an error at line 2.
• F.str : Hello! How are you doing?
• G.str : How are you doing?