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What does the arrow operator, '->', do in Java? - Stack Overflow
Details: Java 6, Apache Commons Collection, IntelliJ 12. Update/Answer: It turns out that IntelliJ 12 supports Java 8, which supports lambdas, and is "folding" Predicates and displaying them as lambdas. Below is the "un-folded" code.

What is the Java ?: operator called and what does it do?
In particular, if Java ever gets another ternary operator, people who use the term "conditional operator" will still be correct and unambiguous - unlike those who just say "ternary operator". Yes, the phrase "ternary operator" has stuck - my answer is part of an effort to "unstick" it, just as I try to correct the claim that "objects are passed ...

java - Using NOT operator in IF conditions - Stack Overflow
Java 11 added isEmpty, but before that there was only isPresent. Image you are trying to return early from a function ( a common programming best practice) Image you are trying to return early from a function ( a common programming best practice)

What does the ^ operator do in Java? - Stack Overflow
Exponentiation in Java. As for integer exponentiation, unfortunately Java does not have such an operator. You can use double Math.pow(double, double) (casting the result to int if necessary). You can also use the traditional bit-shifting trick to compute some powers of two. That is, (1L << k) is two to the k-th power for k=0..63. See also

How do the post increment (i++) and pre increment (++i) operators work ...
Can you explain to me the output of this Java code? int a=5,i; i=++a + ++a + a++; i=a++ + ++a + ++a; a=++a + ++a + a++; System.out.println(a); System.out.println(i ...

What is the percent % operator in java? - Stack Overflow
n%10 means the modulus of 10, that is the remainder you get when you divide with 10. Here it is used to get each digit.

What are the -Xms and -Xmx parameters when starting JVM?
-Xss set java thread stack size -Xprof output cpu profiling data -Xfuture enable strictest checks, anticipating future default -Xrs reduce use of OS signals by Java/VM (see documentation) -Xcheck:jni perform additional checks for JNI functions -Xshare:off do not attempt to use shared class data -Xshare:auto use shared class data if ...

What is the difference between == and equals () in Java?
Since java.lang.String class override equals method, It return true if two String object contains same content but == will only return true if two references are pointing to same object. Here is an example of comparing two Strings in Java for equality using == and equals() method which will clear some doubts:

Setting the default Java character encoding - Stack Overflow
By setting the (Windows) environment variable JAVA_TOOL_OPTIONS to -Dfile.encoding=UTF8, the (Java) System property will be set automatically every time a JVM is started. You will know that the parameter has been picked up because the following message will be posted to System.err: Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8

Proper usage of Java -D command-line parameters
You're giving parameters to your program instead to Java. Use. java -Dtest="true" -jar myApplication.jar instead. Consider using "true".equalsIgnoreCase(System.getProperty("test")) to avoid the NPE. But do not use "Yoda conditions" always without thinking, sometimes throwing the NPE is the right behavior and sometimes something like

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