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Java “lambda expressions not supported at this language level”
I was testing out some new features of Java 8 and copied the example into my IDE (Eclipse originally, then IntelliJ) as shown here
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Uses for the Java Void Reference Type?
There is a Java Void -- uppercase V-- reference type . The only situation I have ever seen it used is to parameterize Callable s
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Enabling ProGuard in Eclipse for Android
...ers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
-keep class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}
-keepclassmembers class **.R$* {
public static <fields>;
}
I think I've answered all t...
Is there a Java reflection utility to do a deep comparison of two objects?
...quality assertion through reflection, with different options like ignoring Java default/null values and ignoring order of collections
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Is there a difference between x++ and ++x in java?
Is there a difference between ++x and x++ in java?
16 Answers
16
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What's a monitor in Java?
What's a monitor referred to in concurrent programming in Java?
7 Answers
7
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What is the use of printStackTrace() method in Java?
... e) {
e.printStackTrace();
}
System.exit(0);
Calling println(e):
java.lang.NullPointerException
Calling e.printStackTrace():
java.io.IOException
at package.Test.main(Test.java:74)
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The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
...r better options to do this more cleanly in a single line, both using only Java built-in classes or using a utility library. See other answers below.
Since strings are immutable, you may want to use the StringBuilder class if you're going to alter the String in the code.
The StringBuilder class ...
Java: Check if enum contains a given string?
... should never be used for ordinary control flow" (Joshua Bloch, "Effective Java").
– james.garriss
May 20 '14 at 16:34
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How to return an array from JNI to Java?
...ur code is going to look something like this:
JNIEXPORT jintArray JNICALL Java_ArrayTest_initIntArray(JNIEnv *env, jclass cls, int size)
{
jintArray result;
result = (*env)->NewIntArray(env, size);
if (result == NULL) {
return NULL; /* out of memory error thrown */
}
int i;
// fill a ...