1z1-830 무료 덤프문제 온라인 액세스

Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

• A.{c=1, b=2, a=3}
• B.Compilation fails
• C.{b=1, c=2, a=3}
• D.{a=3, b=1, c=2}
• E.{a=1, b=2, c=3}
• F.{b=1, a=3, c=2}
• G.{c=2, a=3, b=1}

Which of the followingisn'ta correct way to write a string to a file?

• A.None of the suggestions
• B.java
  try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
  }
• C.java
  try (FileWriter writer = new FileWriter("file.txt")) {
  writer.write("Hello");
  }
• D.java
  try (BufferedWriter writer = new BufferedWriter("file.txt")) {
  writer.write("Hello");
  }
• E.java
  Path path = Paths.get("file.txt");
  byte[] strBytes = "Hello".getBytes();
  Files.write(path, strBytes);
• F.java
  try (PrintWriter printWriter = new PrintWriter("file.txt")) {
  printWriter.printf("Hello %s", "James");
  }

Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

• A.US=UK
• B.-US=UK
• C.Compilation fails.
• D.US-UK
• E.An exception is thrown.
• F.=US-UK

What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

• A.666 666
• B.Compilation fails
• C.666 42
• D.42 42

Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

• A.ClassCastException
• B.Compilation fails
• C.2
• D.NotSerializableException
• E.1