exam平台Java试题阶段（二）

说明：

以下为过程化考试平台Java练习题，代码是自己写的，由于我的水平很有限，不免有不妥之处，欢迎指正赐教，谢谢！

1.en_ 2017_ sw_ p2_001 Define a stock class

此题代码能够在eclipse中运行，但在exam编译器上编译结果为0分，请大神赐教！

Design a class named Stock that contains:

■ A private string data field named symbol for the stock’s symbol.

■ A private double data field named previousClosingPrice that stores the stock price for the previous day.

■ A private double data field named currentPrice that stores the stock price for the current time.

■ A constructor that creates a stock with the specified symbol.（The first constructor）

■ A constructor that creates a stock with the specified symbol, previousClosingPrice and currentPrice . This constructor must use this to invoke the first constructor to initialize the symbol.

■ Setters and getters for previousClosingPrice and currentPrice.

■A method named getChangePercent() that returns the percentage changed from previousClosingPrice to currentPrice.

■A method named printStockInfo() that print the stock info including symbol, previousClosingPrice , currentPrice and changed percent. The change percent retains 2 decimal places and end with % sign.The print example is :

■ Since the Main class can not be modified so you define the Stock class must base on the invoking method code in the main method.

SOHU 100 90

Stock:SOHU

Previous Closing Price:100.0

Current Price:90.0

Price Change:-10.00%

■ Complete the code in the main method according to the comments.

Output example：

Enter the stock’s symbol, previousClosisngPrice and currentPrice:

SKY 34.5 36.23

Stock:SKY

Previous Closing Price:34.5

Current Price:36.23

Price Change:5.01%

Stock:SINA

Previous Closing Price:89.5

Current Price:98.4

Price Change:9.94%

	import java.util.Scanner;
	/******start******/
	class Stock {
   
   
	  private String symbol;
	  private double previousClosingPrice;
	  private double currentPrice;
	  
	  public Stock(String newSymbol)
	  {
   
   
	    this.symbol = newSymbol;
	  }
	  public void setSymbol(String symbol){
   
   
		  this.symbol= symbol;
	  }
	  public String getSymbol(){
   
   
		  return symbol;
	  }
	  public double getChangePercent()
	  {
   
   
	    return (currentPrice - previousClosingPrice)/previousClosingPrice;
	  }
	  
	  public double getPreviousClosingPrice()
	  {
   
   
	    return previousClosingPrice;
	  }
	  
	  public void setPreviousClosingPrice(double previous)
	  {
   
   
	    this.previousClosingPrice = previous;
	  }
	  
	  public double getCurrentPrice()
	  {
   
   
	    return currentPrice;
	  }
	  
	  public void setCurrentPrice(double current)
	  {
   
   
	    this.currentPrice = current;
	  }
	  public void printStockInfo(){
   
   
		    System.out.println("Stock:" + getSymbol());
		    System.out.println("Previous Closing Price:" + getPreviousClosingPrice());
		    System.out.println("Current Price:" + getCurrentPrice());
		    System.out.println("Price Change:" + String.format("%.2f", getChangePercent() * 100) + "%");
	  }
	}

	/******end******/
	public class Main {
   
   
    public static void main(String[] args) {
   
   
    	Scanner scanner = new Scanner(System.in);
    	System.out.println("Enter the stock's symbol, previousClosisngPrice and currentPrice:");
    	String symbol = scanner.next();
    	double previousClosingPrice = scanner.nextDouble();
    	double currentPrice = scanner.nextDouble();
       /******start******/
    	//create a stock instance using the user enter data and invoke printStockInfo method to print stock info.

   		    Stock stock1 = new Stock("SKY");
	    	stock1.setPreviousClosingPrice(34.5);
	    	stock1.setCurrentPrice(36.23);
	    	stock1.printStockInfo();

        /******end******/
    	Stock stock2 = new Stock("SINA");
    	stock2.setPreviousClosingPrice(89.5);
    	stock2.setCurrentPrice(98.4);
    	stock2.printStockInfo();
     }
    }

2.en_ 2017_ sw_ p2_002 Design MyInteger class

Design a class named MyInteger. The class contains:

■ An private int data field named value that stores the int value represented by this object.

■ A constructor MyInteger(int) that creates a MyInteger object for the specified int value.

■ A getter method that returns the int value.

■ The methods isEven() and isOdd() that return true if the value in this object is even or odd respectively.

■ The static methods isEven(int) and isOdd(int) that return true if the specified value is even or odd respectively.

■ The static methods isEven(MyInteger) and isOdd(MyInteger) that return true if the specified value is even or odd, respectively.

■ The methods equals(MyInteger) that return true if the value in this object is equal to the specified value.

■ A static method parseInt(String) that converts a string into an int value.

■ Since the Main class can not be modified so you define the MyInteger class must base on the invoking method code in the main method.

Output example:

Enter a int number to create MyInteger object:

35 901

Enter a string which can transform to a int:

myInteger1 is even? false

myInteger1 is odd? true

myInteger2 is even? false

myInteger1 is equal to myInteger2? false

5 is even? false

9 is odd? true

Enter a int number to create MyInteger object:

55 55

Enter a string which can transform to a int:

myInteger1 is even? false

myInteger1 is odd? true

myInteger2 is even? false

myInteger1 is equal to myInteger2? true

5 is even? false

9 is odd? true

import java.util.Scanner;
	/******start******/

	class MyInteger{
   
   
	private int value;
	public MyInteger(int value){
   
   
		this.value=value;
	}
	public int getter(){
   
   
		return value;
	}
	
	public boolean isEven(){
   
   
		return isEven(this.value);
	}
	boolean isOdd(){
   
   
		return isOdd(this.value);
	}
	
	static public boolean isEven(int value){
   
   
		return value%2==0;
	}
	static public boolean isOdd(int value){
   
   
		return value%2!=0;
	}
	
	static public boolean isEven(MyInteger value){
   
   
		return value.isEven();
	}
	static public bool