Project Coin Examples with JDK 7 Developer Preview

Mark Reinhold announced availability of the first JDK 7 developer preview today. Reason enough for me to give some of the Project Coin features a shot. I won't get into details here, but instead just show some quick examples. Most of them are self-explanatory anyway.

Source code is also available via github.

Strings in switch

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1. final String str = "foo";  
2.   
3. switch (str) {  
4.     case "foo":  
5.         System.out.println("mooh");  
6.         break;  
7.     case "bar":  
8.         System.out.println("miau");  
9.         break;  
10.     default:  
11.         break;  
12. }  

final String str = "foo";

switch (str) {
    case "foo":
        System.out.println("mooh");
        break;
    case "bar":
        System.out.println("miau");
        break;
    default:
        break;
}

Binary integral literals and underscores in numeric literals

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1. final int large = 1_000_000;  
2. System.out.println(large);  
3.      
4. final int binary = 0b1011;  
5. System.out.println(binary);  

final int large = 1_000_000;
System.out.println(large);
   
final int binary = 0b1011;
System.out.println(binary);

Multi-catch and more precise rethrow

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1. class ExA extends Exception {}  
2. class ExB extends Exception {}  
3.   
4. public void testMultiCatch() {  
5.   
6.     final int a = 0;  
7.           
8.     try {  
9.         if (a == 0) {  
10.             throw new ExA();  
11.         }  
12.         if (a == 1) {  
13.             throw new ExB();  
14.         }  
15.     } catch (ExA|ExB ex) {  
16.         System.out.println(ex.getClass() +   
17.              " was thrown and caught");  
18.     }  
19.   
20. }  
21.   
22. public void testReThrow() throws ExB {  
23.   
24.     final int a = 0;  
25.   
26.     try {  
27.         if (a == 0) {  
28.             throw new ExA();  
29.         }  
30.         if (a == 1) {  
31.             throw new ExB();  
32.         }  
33.     } catch (final ExA exa) {  
34.         System.out.println("Exa was caught");  
35.     } catch (final Exception ex) {  
36.         System.out.println(ex.getClass() +   
37.             " was thrown, caught and rethrown");  
38.         throw ex;  
39.     }  
40.   
41. }  

class ExA extends Exception {}
class ExB extends Exception {}

public void testMultiCatch() {

    final int a = 0;
        
    try {
        if (a == 0) {
            throw new ExA();
        }
        if (a == 1) {
            throw new ExB();
        }
    } catch (ExA|ExB ex) {
        System.out.println(ex.getClass() + 
             " was thrown and caught");
    }

}

public void testReThrow() throws ExB {

    final int a = 0;

    try {
        if (a == 0) {
            throw new ExA();
        }
        if (a == 1) {
            throw new ExB();
        }
    } catch (final ExA exa) {
        System.out.println("Exa was caught");
    } catch (final Exception ex) {
        System.out.println(ex.getClass() + 
            " was thrown, caught and rethrown");
        throw ex;
    }

}

Improved type inference for generic instance creation (diamond)

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1. final List<String> list = new ArrayList<>();  
2. list.add("Foo");  
3.           
4. System.out.println(list);  

final List<String> list = new ArrayList<>();
list.add("Foo");
        
System.out.println(list);

try-with-resources statement

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1. try (final BufferedReader br = new BufferedReader(new FileReader("./TestAutomaticResourceManagement.java"))) {  
2.   
3.    String line;  
4.    while ((line = br.readLine()) != null) {  
5.        System.out.println(line);  
6.    }  
7.   
8. } catch (final IOException e) {  
9. }  

try (final BufferedReader br = new BufferedReader(new FileReader("./TestAutomaticResourceManagement.java"))) {

   String line;
   while ((line = br.readLine()) != null) {
       System.out.println(line);
   }

} catch (final IOException e) {
}

Oracle 1-year review

It's been about a year now since Oracle aquired Sun. Here is a short review of what happened since then:

• Oracle pulled the plug on the servers of the PostgreSQL build farm with no warning, see here.
  
  
• Oracle kills OpenSolaris? OpenSolaris Board Quits En Masse, see here and here.
  
  
• Prominent Sun employees leave the company, including James Gosling, Tim Bray, Simon Phipps, Tor Norbye, Kohsuke Kawaguchi, see here.
  
  
• Oracle sues Google over use of Java-related patents in Android's Dalvik VM and SDK, see here.
  
  
• OpenOffice.org declares independence from Oracle, becomes LibreOffice, see here.
  
  
• Doug Lea leaves the JCP, see here.
  
  
• Oracle nominates Hologic for JCP, see here.
  
  
• Java SE 7 and SE 8 specs move forward amid protest, see here.
  
  
• Tim Peierls resigned from JCP EC, see here.
  
  
• Apache resigns from JCP EC, see here.
  
  
• Hudson wants to move from Oracle. This story is still going on, see here and here.
  
  
• Ruby on Rails support discontinued in NetBeans IDE, see here.