double getSalesAmount() { return 1230.45; }
public double getSalesAmount() { return 1230.45; }
private double getSalesAmount() { return 1230.45; }
protected double getSalesAmount() { return 1230.45; }
第1题:
1. class Super { 2. public float getNum() { return 3.0f; } 3. } 4. 5. public class Sub extends Super { 6. 7. } Which method, placed at line6, causes compilation to fail?()
第2题:
10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } 16. class Sales extends Employee { 17. // insert method here 18. } Which two methods, inserted independently at line 17, correctly complete the Sales class?()
第3题:
class One { public One foo() { return this; } } class Two extends One { public One foo() { return this; } } class Three extends Two { // insert method here } Which two methods, inserted individually, correctly complete the Three class?()
第4题:
1. public class ReturnIt { 2. return Type methodA(byte x, double y) { 3. return (short)x / y * 2; 4. } 5. } What is the narrowest valid returnType for methodA in line2?()
第5题:
1. public class Blip { 2. protected int blipvert(int x) { return 0; } 3. } 4. class Vert extends Blip { 5. // insert code here 6. } Which five methods, inserted independently at line 5, will compile?()
第6题:
Object x = t.findLarger(123, “456”);
int x = t.findLarger(123, new Double(456));
int x = t.findLarger(123, new Integer(456));
int x = (int) t.findLarger(new Double(123), new Double(456));
第7题:
int foo() { /* more code here */ }
void foo() { /* more code here */ }
public void foo() { /* more code here */ }
private void foo() { /* more code here */ }
protected void foo() { /* more code here */ }
第8题:
Public float getNum() {return 4.0f; }
Public void getNum (){}
Public void getNum (double d){}
Public double getNum (float d) {retrun 4.0f; }
第9题:
public int blipvert(int x) { return 0; }
private int blipvert(int x) { return 0; }
private int blipvert(long x) { return 0; }
protected long blipvert(int x, int y) { return 0; }
protected int blipvert(long x) { return 0; }
protected long blipvert(long x) { return 0; }
protected long blipvert(int x) { return 0; }
第10题:
public void getNum(){}
public void getNum(double d){}
public float getNum() { return 4.0f; }
public double getNum(float d) { return 4.0d; }
第11题:
static class InnerOne { public double methoda() { return d1; } }
static class InnerOne { static double methoda() { return d1; } }
private class InnerOne { public double methoda() { return d1; } }
protected class InnerOne { static double methoda() { return d1; } }
public abstract class InnerOne { public abstract double methoda(); }
第12题:
double getSalesAmount() { return 1230.45; }
public double getSalesAmount() { return 1230.45; }
private double getSalesAmount() { return 1230.45; }
protected double getSalesAmount() { return 1230.45; }
第13题:
class super { public float getNum() {return 3.0f;} } public class Sub extends Super { } Which method, placed at line 6, will cause a compiler error?()
第14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?()
第15题:
1. public class OuterClass { 2. private double d1 = 1.0; 3. // insert code here 4. } Which two are valid if inserted at line 3?()
第16题:
public class returnIt ( returnType methodA(byte x, double y) ( return (short) x/y * 2; ) ) What is the valid returnType for methodA in line 2?()
第17题:
You work as an application developer at Certkiller .com. You have been given the responsibility of creating a class named CalcSalary that will determine the salaries of Certkiller .com’s staff. The CalcSalary class includes methods to increment and decrement staff salaries. The following code is included in the CalcSalary class: public class CalcSalary { // for promotions public static bool IncrementSalary (Employee Emp, double Amount) { if (Emp.Status == QuarterlyReview.AboveGoals) Emp.Salary += Amount; return true; } else return false; } //for demotions public static bool DecrementSalary (Employee Emp, double Amount) { if (Emp.Status == QuarterlyReview.AboveGoals) Emp.Salary -= Amount; return true; } else return false; } } You would like to invoke the IncrementSalary and DecrementSalary methods dynamically at runtime from the sales manager application, and decide to create a delegate named SalaryDelegate to invoke them. You need to ensure that you use the appropriate code to declare the SalaryDelegate delegate.What is the correct line of code?()
第18题:
static class InnerOne { public double methoda() {return d1;} }
static class InnerOne { static double methoda() {return d1;} }
private class InnerOne { public double methoda() {return d1;} }
protected class InnerOne { static double methoda() {return d1;} }
public abstract class InnerOne { public abstract double methoda(); }
第19题:
public int sum(int a, int b) { return a + b; }
public int sum(long a, long b) { return 0; }
abstract int sum();
private long sum(long a, long b) { return a + b; }
public long sum(long a, int b) { return a + b; }
第20题:
protected int blipvert(long x) { return 0; }
protected long blipvert(int x) { return 0; }
private int blipvert(long x) { return 0; }
private int blipvert(int x) { return 0; }
public int blipvert(int x) { return 0; }
protected long blipvert(long x) { return 0; }
protected long blipvert(int x, int y) { return 0; }
第21题:
public int method1(int a, int b) { return 0; }
private int method1(int a, int b) { return 0; }
private int method1(int a, long b) { return 0; }
public short method1(int a, int b) { return 0: }
static protected int method1(int a, int b) { return 0; }
第22题:
float getVar() { return x; }
public float getVar() { return x; }
public double getVar() { return x; }
protected float getVar() { return x; }
public float getVar(float f) { return f; }
第23题:
public void foo() { }
public int foo() { return 3; }
public Two foo() { return this; }
public One foo() { return this; }
public Object foo() { return this; }