Int
Byte
Long
Short
Float
Double
第1题:
Which will declare a method that is available to all members of the same package and can be referenced without an instance of the class?()
第2题:
1. public interface A { 2. public void doSomething(String thing); 3. } 1. public class AImpl implements A { 2. public void doSomething(String msg) { } 3. } 1. public class B { 2. public A doit() { 3. // more code here 4. } 5. 6. public String execute() { 7. // more code here 8. } 9. } 1. public class C extends B { 2. public AImpl doit() { 3. // more code here 4. } 5. 6. public Object execute() { 7. // more code here 8. } 9. } Which statement is true about the classes and interfaces in the exhibit?()
第3题:
编译和运行以下代码结果为:
1. public class EqualsTest{
2. public static void main(String args[]){
3. byte A=(byte)4096;
4. if(A== 4096、System.out.println("Equal");
5. else System.out.println("Not Equal");
6. }
7. }
A.在第3行出现转换丢失精度的编译错误.
B.输出 "Not Equal".
C.输出 "Equal".
第4题:
现有2 个文件: 1. package x; 2. public class X { 3. public static void doX() { System.out.print("doX "); } 4. } 和: 1. class Find { 2. public static void main(String [] args) { 3. //insert code here 4. } 5. } 哪两行分别插入到类Find 的第3 行将编译并产生输出“doX”? ()
第5题:
Given classes defined in two different files: 1. package util; 2. public class BitUtils { 3. private static void process(byte[] b) { } 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?()
第6题:
Which will declare a method that is available to all members of the same package and be referenced without an instance of the class?()
第7题:
public class TestA{ public void methodA() throws IOException{ //…… } } public class TestB extends TestA{ public void methodA() throws EOFException{ //…… } } public class TestC extends TestA{ public void methodA() throws Exception{ //…… } } 当编译类TestC的时候,结果是哪项?()
第8题:
1. public class ReturnIt { 2. return Type methodA(byte x, double y) { 3. return (long)x / y * 2; 4. } 5. } What is the narrowest valid returnType for methodA in line2?()
第9题:
public class X { public static void main (String args) { byte b = 127; byte c = 126; byte d = b + c; } } Which statement is true?()
第10题:
public class OuterClass { private double d1 1.0; //insert code here } You need to insert an inner class declaration at line2. Which two inner class declarations are valid?()