java-7

问题 I'm trying to figure out the following issue related to BigIntegers in Java 7 x64. I am attempting to calculate a number to an extremely high power. Code is below, followed by a description of the problem. import java.math.BigInteger; public class main { public static void main(String[] args) { // Demo calculation; Desired calculation: BigInteger("4096").pow(800*600) BigInteger images = new BigInteger("2").pow(15544); System.out.println( "The number of possible 16 bpc color 800x600 images is:

问题 If a popup menu is still open when another component is clicked, then the component does not get the event, because it's probably consumed by the popup. This happens for all JPopupmenus in general. This happens only in Java 7 with windows LAF (Windows7). Is there a workaround? Is it a known bug? import javax.swing.*; import java.awt.event.*; public class Test { public static void main(String[] s) throws Exception { String lookAnfFeelClassName = UIManager.getSystemLookAndFeelClassName();

问题 If a popup menu is still open when another component is clicked, then the component does not get the event, because it's probably consumed by the popup. This happens for all JPopupmenus in general. This happens only in Java 7 with windows LAF (Windows7). Is there a workaround? Is it a known bug? import javax.swing.*; import java.awt.event.*; public class Test { public static void main(String[] s) throws Exception { String lookAnfFeelClassName = UIManager.getSystemLookAndFeelClassName();

问题 Since Apple forced the update to JDK 7 on Mac, old AWT applets no longer support copy/paste. For example, if you visit: Simple AWT Textfield Example you cannot copy and paste into the applet text field on that page. I've confirmed that you can still copy/paste in AWT on Windows with JDK 7. Anybody know a workaround? 回答1: Oracle released Java 6 Update 24 in February 2011 to remedy 21 vulnerabilities: Announcement As part of this security release, the ability to copy & paste from a computer's

问题 Since Apple forced the update to JDK 7 on Mac, old AWT applets no longer support copy/paste. For example, if you visit: Simple AWT Textfield Example you cannot copy and paste into the applet text field on that page. I've confirmed that you can still copy/paste in AWT on Windows with JDK 7. Anybody know a workaround? 回答1: Oracle released Java 6 Update 24 in February 2011 to remedy 21 vulnerabilities: Announcement As part of this security release, the ability to copy & paste from a computer's

问题 This code works fine in Java 1.6: public static String padLeft(String s, int n) { if (n <= 0) return s; int noOfSpaces = n * 2; String output; noOfSpaces = s.length() + noOfSpaces; output = String.format("%1$#" + noOfSpaces + "s", s); return output; } But newer versions (and some other VM implementations) throw this Exception : java.util.FormatFlagsConversionMismatchException: Mismatched Convertor =s, Flags= # at java.util.Formatter$Transformer.transformFromString(Formatter.java:1020) at java

问题 Android SDK requirements state that either JDK 5 or JDK 6 is required. However, I have a Java class library written in Java 7 and I would like to use it for my Android project. Instead of manually converting Java 7 to Java 6 by hand, I was wondering if anyone know of a converter that could do this job for me? Or do we have to code one up from scratch? 回答1: Do you have the source for the JAR? If so, you can use the javac -target parameter set to either 5 or 6 to generate either Java 5 or 6

问题 Android SDK requirements state that either JDK 5 or JDK 6 is required. However, I have a Java class library written in Java 7 and I would like to use it for my Android project. Instead of manually converting Java 7 to Java 6 by hand, I was wondering if anyone know of a converter that could do this job for me? Or do we have to code one up from scratch? 回答1: Do you have the source for the JAR? If so, you can use the javac -target parameter set to either 5 or 6 to generate either Java 5 or 6

问题 Hi I am running a maven test using maven 3.0.3 with hibernate 4.0.0 Final release and spring 3.1 on jdk7 update 2. I get the following error. Caused by: java.lang.VerifyError: Expecting a stackmap frame at branch target 63 in method ${myDomainClass}.equals(Ljava/lang/Object;)Z at offset 24 at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2442) at java.lang.Class.getDeclaredMethods(Class.java:1808) at org.hibernate.property

问题 In the try -with-resources construct of Java 7 , I can declare a resource in the try statement, and it will be closed automatically when it goes out of scope. However, I don't find any indication of the scope of the resource made available. Specifically, is it available in the catch / finally blocks of the try block where it is declared? I tried the following in Eclipse Kepler , but it's giving a mixed impression: Resource variable is made available by Content Assist (Code Completion) : Quick