java-7

I want to get details about this feature of Java7 like this code public String getPostcode(Person person) { if (person != null) { Address address = person.getAddress(); if (address != null) { return address.getPostcode(); } } return null; } Can be do something like this public String getPostcode(Person person) { return person?.getAddress()?.getPostcode(); } But frankly its not much clear to me.Please explain? Null-safe method invocation was proposed for Java 7 as a part of Project Coin, but it didn't make it to final release. See all the proposed features, and what all finally got selected

This question already has an answer here: Java type inference: reference is ambiguous in Java 8, but not Java 7 2 answers public static void main(String... args){ then(bar()); // Compilation Error } public static <E extends Exception> E bar() { return null; } public static void then(Throwable actual) { } public static void then(CharSequence actual) { } Compilation result (from command line javac Ambiguous.java ) Ambiguous.java:4: error: reference to then is ambiguous then(bar()); ^ both method then(Throwable) in Ambiguous and method then(CharSequence) in Ambiguous match 1 error Why this method

I understand that the Oracle Java SE contains closed source extensions and tools that are not part of the OpenJDK however is the Oracle Java SE JVM identical to the OpenJDK JVM or does Oracle make changes to the OpenJDK JVM before releasing it as a Java SE JVM? Update 1: I found some info from the JDK7 updates projects: http://openjdk.java.net/projects/jdk7u/qanda.html Will the 7 Update Project receive security fixes from Oracle? Yes. As with OpenJDK 6, security fixes are first kept confidential and applied to a private forest before being pushed to the public forest as part of the general

Since Java 7 regular expressions API offers support for named capturing groups. The method java.util.regex.Matcher.group(String) returns the input subsequence captured by the given named-capturing group, but there's no example available on API documentations. What is the right syntax to specify and retrieve a named capturing group in Java 7? nhahtdh Specifying named capturing group Use the following regex with a single capturing group as an example ([Pp]attern) . Below are 4 examples on how to specify a named capturing group for the regex above: (?<Name>[Pp]attern) (?<group1>[Pp]attern) (?

I am doing a POC on Java 7 new features. I have code to use String in switch statement and it works. I want to make it work in case insensitive also. Is there a way to check out with ignoreCase on String? package com.java.j7; public class Test { final private String _NEW ="NEW"; final private String _PENDING = "PENDING"; final private String _CLOSED = "CLOSED"; final private String _REJECTED ="REJECTED"; public static void main(String... strings){ Test j = new Test(); j.processItem("new"); j.processItem("pending"); j.processItem("closed"); j.processItem("rejected"); } void processItem(String s

JCombobox in Java 7 has been updated to use generics - I always thought it was a bit of an oversight that it didn't already so I was pleased to see this change. However, when attempting to use JCombobox in this way, I realised that the methods I expected to use these generic types still just return Object. Why on earth is this? It seems like a silly design decision to me. I realise the underlying ListModel has a generic getElementAt() method so I'll use that instead - but it's a bit of a roundabout way of doing something that appears like it could have been changed on JComboBox itself. jarnbjo