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import java.util.*; public class PQ { public static void main(String[] args) { PriorityQueue
- 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
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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
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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.
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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
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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[])
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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
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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.
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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.
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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.
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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.
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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.
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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?()
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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.
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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.
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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.
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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
考题
单选题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.
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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.
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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.
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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?()
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0B
1C
2D
Compilation fails.
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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.
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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.
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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.
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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.
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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
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