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How to convert/parse from String to char in java?
How do I parse a String value to a char type, in Java?
14 Answers
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How to use wait and notify in Java without IllegalMonitorStateException?
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While using the wait and notify or notifyAll methods in Java the following things must be remembered:
Use notifyAll instead of notify if you expect that more than one thread will be waiting for a lock.
The wait and notify methods must be called in a synchronized context. See t...
Use of class definitions inside a method in Java
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Any idea in which version of Java local classes where introduced?
– Sled
Nov 6 '14 at 17:32
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How can I concatenate two arrays in Java?
I need to concatenate two String arrays in Java.
61 Answers
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How can I generate a list or array of sequential integers in Java?
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With Java 8 it is so simple so it doesn't even need separate method anymore:
List<Integer> range = IntStream.rangeClosed(start, end)
.boxed().collect(Collectors.toList());
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Java: Getting a substring from a string starting after a particular character
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This can also get the filename
import java.nio.file.Paths;
import java.nio.file.Path;
Path path = Paths.get("/abc/def/ghfj.doc");
System.out.println(path.getFileName().toString());
Will print ghfj.doc
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What is the difference between & and && in Java?
I always thought that && operator in Java is used for verifying whether both its boolean operands are true , and the & operator is used to do Bit-wise operations on two integer types.
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Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?
...ne can provide some insight as to what's fundamentally different about the Java Virtual Machine that allows it to implement threads nicely without the need for a Global Interpreter Lock (GIL), while Python necessitates such an evil.
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Java Interfaces/Implementation naming convention [duplicate]
...ck. Not ITruck because it isn't an ITruck it is a Truck.
An Interface in Java is a Type. Then you have DumpTruck, TransferTruck, WreckerTruck, CementTruck, etc that implement Truck.
When you are using the Interface in place of a sub-class you just cast it to Truck. As in List<Truck>. Putti...
Downcasting in Java
Upcasting is allowed in Java, however downcasting gives a compile error.
11 Answers
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