New Changes in JDK7

JDK7 is packaged with these new changes
– Small language changes
– NIO-2 Enhanced NIO
– invokedynamic
– other features

Small language Changes:

  • Now integer can accept binary format (along with octal and hexadecimal values)
<pre>int i = 0b10110
  • Switch statement can accept string variables. Since String object in Java is considered immutable, java community has come up with this concept

usage:

public int useSwitch(String strCase) {
switch(strCase) {
case "A":
return 1;
case "B":
return 2;
...
default:
return 10;
}
}
  • Inferring types with <>: while using generics RHS of stmt can be replaced with just <>

usage:

</pre>
List<String> list = new ArrayList<>();
<pre>

Note: No need to explicitly mentioned type on the RHS

  • Easy rethrow (replace multiple catch blocks with single catch block)

usage:

try {
// Reflective operations calling Class.forName,
// Class.newInstance, Class.getMethod,
// Method.invoke, etc.
...
} catch(final FileNotFoundException |
SQLException |
ClassNotFoundException) {
log(e);
throw e;
}

// try with resources
try (InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(ds)) {
byte[] buf = new byte[8192];
int n;
while ((n = in.read(buf)) >= 0)
out.write(buf, 0, n);
}

NIO-2 Enhanced NIO
NIO-2 (Enhanced Asynchronous NIO)

invokedynamic
Dynamic linking of method by the JVM is introduced

Other Features:
Fork joins (for recursive functionalities) – Multi process environment

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