JAVA Programming, 1/e

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• JAVA Programming, 1/e

• By: K. Rajkumar

• Publisher: Pearson India

• Pub. Date: May 1, 2013

• Web ISBN-13: 978-9-3-3251787-5

• Pages in Print Edition: 696

• Subscriber Rating: [0 Ratings]

• 
  
  

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关键词：Programming Program gram Ming Java JAVA

1. Example 1.4. Creating Constants
   
2. 
   
3. public static final int MAX = 100;
   
4. public static final boolean isModified = false;

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1. Example 1.6. Type Casting
   
2. 
   
3. int x = 100;
   
4. long y = x; // upcasting
   
5. int z = (int)y; // downcasting
   
6. 100 + “hello” becomes “100hello” // concatenation

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1. Example 1.7. Boxing and Unboxing
   
2. 
   
3. Integer i = 5; // auto-boxing
   
4. int j = 0;
   
5. j = new Integer(5); // unboxing

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1. Listing 1.2. WelcomeMe Application
   
2. 
   
3. // WelcomeMe.java
   
4. 
   
5. 
   
6. public class WelcomeMe
   
7. {
   
8.   public static void main(String[] args)
   
9.   {
   
10.     System.out.println(“Hello” + args[0]);
    
11.   }
    
12. }

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1. Listing 1.3. SumIt Application
   
2. 
   
3. 
   
4. 
   
5. // Sumlt.java
   
6. import java.io.*;
   
7. 
   
8. 
   
9. public class SumIt
   
10. {
    
11.   public static void main(String[] args) throws IOException
    
12.   {
    
13.     // Step1: read data from command line parameters and add them
    
14.     int sum = Integer.parseInt(args[0]) + Integer.parseInt(args[1]);
    
15.     // Step2: show result
    
16.     System.out.println(“Sum: ” + sum);
    
17.   }
    
18. }

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1. Listing 1.4. SumIt2 with Exception Handling
   
2. 
   
3. 
   
4. 
   
5. // SumIt2.java
   
6. import java.io.*;
   
7. 
   
8. 
   
9. public class SumIt2
   
10. {
    
11.   public static void main(String[] args) throws IOException
    
12.   {
    
13.     try
    
14.     {
    
15.       int sum = Integer.parseInt(args[0]) + Integer.parseInt(args[1]);
    
16.       System.out.println(“Sum: ” + sum);
    
17.     }
    
18.     catch (NumberFormatException e)
    
19.       System.out.println(“Enter 2 integers in command prompt”);
    
20.     }
    
21.   }
    
22. }

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1. 
   
2. // PrintName.java
   
3. import java.io.*;
   
4. import java.util.*;
   
5. 
   
6. public class PrintName
   
7. {
   
8.   public static void main(String[] args)
   
9.   {
   
10.     // Step1: create a Scanner instance to keyboard
    
11.     Scanner sc = new Scanner(System.in);
    
12.     // Step2: get first name
    
13.     System.out.print(“Enter your first name: ” );
    
14.     String fname = sc.nextLine();
    
15.     // Step3: get last name
    
16.     System.out.print(“Enter your last name: ” );
    
17.     String lname = sc.nextLine();
    
18.     // Step4: show
    
19.     System.out.print(“Your name is ” + lname + “ ” +fname);
    
20.   }
    
21. }

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1. Listing 1.6. PrintSum Application
   
2. 
   
3. // PrintSum.java
   
4. import java.util.*;
   
5. 
   
6. public class PrintSum
   
7. {
   
8.   public static void main(String[] args)
   
9.   {
   
10.     // Step1: create a Scanner instance to keyboard
    
11.     Scanner sc = new Scanner(System.in);
    
12.     // Step2: get first number
    
13.     System.out.print(“Enter integer1: ” );
    
14.     int a = sc.nextInt();
    
15.     // Step3: get second number
    
16.     System.out.print(“Enter integer2: ” );
    
17.     int b = sc.nextInt();
    
18.     // Step4: discard \n
    
19.     sc.nextLine();
    
20.     // Step5: get name
    
21.     System.out.print(“Enter your name: ” );
    
22.     String name = sc.nextLine();
    
23.     // Step6: show
    
24.     System.out.println(“Hello ” + name + “ Sum is ” + (a+b));
    
25.   }
    
26. }

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