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import java.util.*;  public class PQ {  public static void main(String[] args) {  PriorityQueue pq = new PriorityQueue();  pq.add(”carrot”); pq.add(”apple”);  pq.add(”banana”);  System.out.println(pq.poll() +”:” + pq.peek()); }  }  What is the result?() 

  • A、 apple:apple
  • B、 carrot:apple
  • C、 apple:banana
  • D、 banana:apple
  • E、 carrot:carrot
  • F、 carrot:banana

参考答案

更多 “ import java.util.*;  public class PQ {  public static void main(String[] args) {  PriorityQueue pq = new PriorityQueue();  pq.add(”carrot”); pq.add(”apple”);  pq.add(”banana”);  System.out.println(pq.poll() +”:” + pq.peek()); }  }  What is the result?() A、 apple:appleB、 carrot:appleC、 apple:bananaD、 banana:appleE、 carrot:carrotF、 carrot:banana” 相关考题
考题 importjava.util.*;publicclassPQ{publicstaticvoidmain(String[]args){PriorityQueuepq=newPriorityQueue();pq.add(”carrot”);pq.add(”apple”);pq.add(”banana”);System.out.println(pq.poll()+”:”+pq.peek());}}Whatistheresult?()A.apple:appleB.carrot:appleC.apple:bananaD.banana:appleE.carrot:carrotF.carrot:banana

考题 interface A{int x = 0;}class B{int x =1;}class C extends B implements A {public void pX(){System.out.println(x);}public static void main(String[] args) {new C().pX();}}

考题 class MyThread extends Thread {  public void run() { System.out.println(“AAA”); }  public void run(Runnable r) { System.out.println(“BBB”); }  public static void main(String[] args) {  new Thread(new MyThread()).start();  }  }   What is the result?()  A、 AAAB、 BBBC、 Compilation fails.D、 The code runs with no output.

考题 import java.util.*;  class Banana3 {  public static void main(String [] args) {  int x = 2;  Banana3 b = new Banana3();  b.go(x);  }  static { x += x; }  void go(int x) {  ++x;  System.out.println(x);  }  }  结果为:()  A、2B、3C、5D、编译失败

考题 Which declarations will allow a class to be started as a standalone program?()  A、public void main(String args[])B、public void static main(String args[])C、public static main(String[] argv)D、final public static void main(String [] array)E、public static void main(String args[])

考题 class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()  A、 Compilation fails.B、 hello from aC、 hello from bD、 hello from b hello from aE、 hello from a hello from b

考题 class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()  A、 0B、 1C、 2D、 Compilation fails.

考题 public class Test {  private static float[] f = new float[2];  public static void main(String args[]) {  System.out.println(“f[0] = “ + f[0]);  }  }   What is the result?()  A、 f[0] = 0B、 f[0] = 0.0C、 Compilation fails.D、 An exception is thrown at runtime.

考题 class TestA {  public void start() { System.out.println(”TestA”); }  }  public class TestB extends TestA {  public void start() { System.out.println(”TestB”); } public static void main(String[] args) {  ((TestA)new TestB()).start();  }  }  What is the result?() A、 TestAB、 TestBC、 Compilation fails.D、 An exception is thrown at runtime.

考题 public class Test {  public static void main(String[] args) {  String str = NULL;  System.out.println(str);  }  }   What is the result?()  A、 NULLB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.

考题 public class Test {  public static void aMethod() throws Exception {  try {  throw new Exception(); } finally {  System.out.println(“finally”);  }  }  public static void main(String args[]) {  try {  aMethod();  } catch (Exception e) {  System.out.println(“exception”);  }  System.out.println(“finished”);  }  }  What is the result?()  A、 finallyB、 exception finishedC、 finally exception finishedD、 Compilation fails.

考题 Public class test (  Public static void stringReplace (String text)  (  Text = text.replace (‘j’ , ‘i’);  )  public static void bufferReplace (StringBuffer text)  (  text = text.append (“C”)  )   public static void main (String args[]}  (  String textString = new String (“java”); StringBuffer text BufferString = new StringBuffer (“java”);  stringReplace (textString);  bufferReplace (textBuffer);  System.out.printLn (textString + textBuffer);  ) )  What is the output?()

考题 public class Foo {  public static void main(String[] args) {  try {  return;  } finally {  System.out.println( “Finally” );  }  }  }  What is the result?()A、 FinallyB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.

考题 public class Yikes {  public static void go(Long n) {System.out.println(”Long “);}  public static void go(Short n) {System.out.println(”Short “);}  public static void go(int n) {System.out.println(”int “);}  public static void main(String [] args) {  short y= 6;  long z= 7;  go(y);  go(z);  }  }  What is the result?() A、 int LongB、 Short LongC、 Compilation fails.D、 An exception is thrown at runtime.

考题 interface Beta {}  class Alpha implements Beta {  String testIt() {  return “Tested”;  }  }  public class Main1 {  static Beta getIt() {  return new Alpha();  }  public static void main( String[] args ) {  Beta b = getIt();  System.out.println( b.testIt() );  }  }  What is the result?()  A、 TestedB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.

考题 单选题import java.util.*;  public class PQ {  public static void main(String[] args) {  PriorityQueue pq = new PriorityQueue();  pq.add(”carrot”); pq.add(”apple”);  pq.add(”banana”);  System.out.println(pq.poll() +”:” + pq.peek()); }  }  What is the result?()A  apple:appleB  carrot:appleC  apple:bananaD  banana:appleE  carrot:carrotF  carrot:banana

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考题 单选题class MyThread extends Thread {  public void run() { System.out.println(“AAA”); }  public void run(Runnable r) { System.out.println(“BBB”); }  public static void main(String[] args) {  new Thread(new MyThread()).start();  }  }   What is the result?()A  AAAB  BBBC  Compilation fails.D  The code runs with no output.

考题 单选题interface Beta {}  class Alpha implements Beta {  String testIt() {  return “Tested”;  }  }  public class Main1 {  static Beta getIt() {  return new Alpha();  }  public static void main( String[] args ) {  Beta b = getIt();  System.out.println( b.testIt() );  }  }  What is the result?()A  TestedB  Compilation fails.C  The code runs with no output.D  An exception is thrown at runtime.

考题 填空题Public class test (  Public static void stringReplace (String text)  (  Text = text.replace (‘j’ , ‘i’);  )  public static void bufferReplace (StringBuffer text)  (  text = text.append (“C”)  )   public static void main (String args[]}  (  String textString = new String (“java”);  StringBuffer text BufferString = new StringBuffer (“java”);  stringReplace (textString);  BufferReplace (textBuffer);  System.out.printLn (textString + textBuffer);  )  )   What is the output?()

考题 单选题class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()A  0B  1C  2D  Compilation fails.

考题 单选题class TestA {  public void start() { System.out.println(”TestA”); }  }  public class TestB extends TestA {  public void start() { System.out.println(”TestB”); } public static void main(String[] args) {  ((TestA)new TestB()).start();  }  }  What is the result?()A  TestAB  TestBC  Compilation fails.D  An exception is thrown at runtime.

考题 单选题public class Yikes {  public static void go(Long n) {System.out.println(”Long “);}  public static void go(Short n) {System.out.println(”Short “);}  public static void go(int n) {System.out.println(”int “);}  public static void main(String [] args) {  short y= 6;  long z= 7;  go(y);  go(z);  }  }  What is the result?()A  int LongB  Short LongC  Compilation fails.D  An exception is thrown at runtime.

考题 单选题public class Test {  public static void aMethod() throws Exception {  try {  throw new Exception(); } finally {  System.out.println(“finally”);  }  }  public static void main(String args[]) {  try {  aMethod();  } catch (Exception e) {  System.out.println(“exception”);  }  System.out.println(“finished”);  }  }  What is the result?()A  finallyB  exception finishedC  finally exception finishedD  Compilation fails.

考题 单选题class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()A  Compilation fails.B  hello from aC  hello from bD  hello from b hello from aE  hello from a hello from b

考题 单选题public class Test {  public static void main(String[] args) {  String str = NULL;  System.out.println(str);  }  }   What is the result?()A  NULLB  Compilation fails.C  The code runs with no output.D  An exception is thrown at runtime.

考题 单选题import java.util.*;  class Banana3 {  public static void main(String [] args) {  int x = 2;  Banana3 b = new Banana3();  b.go(x);  }  static { x += x; }  void go(int x) {  ++x;  System.out.println(x);  }  }  结果为:()A 2B 3C 5D 编译失败