Java 7 Max Ramos Associate Software Engineer, Orange & Bronze Software Labs Oracle Certified Professional (Java SE 6 Programmer)
New syntax elements of java 7
Jan 15, 2015
Max Ramos, Oracle Certified Professional & Associate Software Engineer of Orange and Bronze Software Labs, discusses the new syntax elements of Java 7.
www.orangeandbronze.com
www.orangeandbronze.com
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Java 7Max RamosAssociate Software Engineer, Orange & Bronze Software LabsOracle Certified Professional (Java SE 6 Programmer)
Overview
Binary Literals Underscore in Numerical Literals String in switch statement Diamond operator Multi-catch Try-with-resources
Binary Literals
Before Java 7
int decimal = 100;
int octal = 010; // decimal 8
int hexadecimal = 0x1f; // decimal 31
In Java 7
int b = 0b100; // decimal 2
or
int b = 0B100;
Underscore in numerical literals
Before Java 7
long largeNumber = 94158725;
long manyZeroes = 100000000;
In Java 7
long largeNumber = 94_158_725;
long manyZeroes = 100_000_000;
In Java 7
int i = 1000;
int j = 1_000;
if (I == j) { // true
}
or
If (1000 == 1_000) { // true
}
String in switch statement
Before Java 7
if (size.equals(“Short”)) {
// do something
} else if (size.equals(“Tall”)) {
// do something
} else if (size.equals(“Grande”)) {
// do something
} else if (size.equals(“Venti”)) {
// do something
} else {
// do something
}
In Java 7
switch (size) {
case “Short”: // do something
case “Tall”: // do something
case “Grande”: // do something
case “Venti”: // do something
default: // do something
}
Diamond operator
Before Java 7
List<String> list = new ArrayList<String>();
Set<Integer> set = new HashSet<Integer>();
Map<String, Object> map = new HashMap<String, Object>();
In Java 7
List<String> names = new ArrayList<>();
Set<Integer> count = new HashSet<>();
Map<String, Object> map = new HashMap<>();
Multi-catch
Before Java 7
try {
// do something that might throw an exception
} catch (ParseException e) {
// do something
} catch (IOException e) {
// do that same thing again
}
In Java 7
try {
// do something that might throw an exception
} catch (ParseException | IOException e) {
// do something
}
Try-with-resources
Before Java 7
public int methodName(String path) throws IOException {
FileReader fr = new FileReader(path);
try {
return fr.read()
} finally {
if (fr != null)
fr.close();
}
}
In Java 7
public int methodName(String path) throws IOException {
try (FileReader fr = new FileReader(path)){
return fr.read()
}
}
In Java 7
public void methodName(String path) throws IOException {
try (
FileReader fr = new FileReader(path);
FileWriter fw = new FileWriter(“out.txt”)
){
int i = fr.read();
fw.write(i);
}
}
About Orange & Bronze Software Labs
• Filipino software development company specializing in Java technology
• Consulting, outsourcing, and offshore product development services using Open Source technologies, with a specialization in the Spring and Grails frameworks
• Enterprise solutions with Google enterprise products and business intelligence solutions with the Pentaho BI Suite
• Offers Java, Agile and Android training courses
www.orangeandbronze.com
End
Related Documents
