java-7

问题 JDK 7 added a new transparency slider to the JColorChooser: The problem is that I do not want to allow my users to pick transparent colors. Unfortunately, there doesn't seem to be an easy way to disable the slider. One way to get rid of the transparency is to just create a new color based on the selected one but removing the alpha value. However, this gives a false impression to the user as the slider now effectively does nothing and I would hate to have a useless UI element around. So my

问题 I created a new project in Android Studio and added a Google Maps activity. I get these warnings: warning: com/google/android/gms/maps/GoogleMap.class(com/google/android/gms/maps:GoogleMap.class): major version 51 is newer than 50, the highest major version supported by this compiler. It is recommended that the compiler be upgraded. warning: com/google/android/gms/maps/SupportMapFragment.class(com/google/android/gms/maps:SupportMapFragment.class): major version 51 is newer than 50, the

问题 HERES THE ANSWER: It appears (through our testing) that Java 7 Web Start requires you to host your resources on a server using an SSL certificate. Your cert does NOT have to be signed, but unsigned certs will prompt the client with a trust message that they can ignore. See the below answer for more details We have an internal application which we have been using for many years now. In order to make maintenance easier for this application we have not provided an installable version of the

问题 I checked the below page that there is no method to get current time with accuracy in microsecond in Java in 2009. Current time in microseconds in java The best one is System.currentTimeMillis() which gives current time with accuracy in millisecond, while System.nanoTime() gives the current timestamp with accuracy in nanoseconds, but this timestamp could not be used to convert to current time with high accuracy. May I know if there is any new update in this for Java after 6 years? Thanks.

问题 Consider this Java code which attempts to instantiate some List s: List<String> list1 = new ArrayList<String>(); List<String> list2 = new ArrayList<>(); List<String> list3 = new ArrayList<String>() { }; List<String> list4 = new ArrayList<>() { }; List<String> list5 = new ArrayList<Integer>() { }; list1 and list2 are straightforward; list2 uses the new diamond operator in Java 7 to reduce unnecessary repetition of the type parameters. list3 is a variation on list1 using an anonymous class,

问题 I have a text file named foo.txt , and its contents are as below: this is text How would I print this exact file to the screen in Java 7? 回答1: Before Java 7: BufferedReader br = new BufferedReader(new FileReader("foo.txt")); String line; while ((line = br.readLine()) != null) { System.out.println(line); } add exception handling add closing the stream Since Java 7, there is no need to close the stream, because it implements autocloseable try (BufferedReader br = new BufferedReader(new

问题 I'm getting into Java7 development and I've added JDK7 into Java Platforms and have selected it in the project properties. But when I'm compiling, I get messages like: warning: java/lang/Boolean.class(java/lang:Boolean.class): major version 51 is newer than 50, the highest major version supported by this compiler. It is recommended that the compiler be upgraded. and javac: invalid target release: 1.7 /Applications/NetBeans/NetBeans 7.1.app/Contents/Resources/NetBeans/harness/suite.xml:184:

问题 I am a new comer to the android world and with a .NET background. I am trying to install the Android Studio but I am having a mismatch on Android.com about the JDK version required for developing Android applications. From the SDK web page it states that JDK 6 is required (under system requirements section). Jim Wilson also insist in his course on Pluralsight (which is quite new, from last May) that using version 7 with the Android SDK will create a lot of headache and makes it clear to only

问题 This is a test about thread priority. The code is from Thinking in Java p.809 import java.util.concurrent.*; public class SimplePriorities implements Runnable { private int countDown = 5; private volatile double d; // No optimization private int priority; public SimplePriorities(int priority) { this.priority = priority; } public String toString() { return Thread.currentThread() + ": " + countDown; } public void run() { Thread.currentThread().setPriority(priority); while (true) { // An

问题 I am trying out the new Gmail API and the samples use the classes in the java.nio.file package, e.i. Files and FileSystems . These classes was introduced in Java jdk 1.7 for the record, and since I am running jdk 1.7.0_65 in my Android app I have no idea why Android Studio cannot find these classes. The imports are: import java.nio.file.FileSystems; import java.nio.file.Files; My build.gradle file of course tells the system to use v. 1.7 like this android { compileSdkVersion 19