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A thread is alive or running if it has been started and has not yet died. To check whether a thread is alive use the isAlive() method of Thread class. It will return true if this thread is alive, otherwise return false. package org.kodejava.lang; public class ThreadAliveDemo implements Runnable { public static void main(String[] args) […]
You can test if a thread is a daemon thread or a user thread by calling the isDaemon() method of the Thread class. If it returns true then the thread is a daemon thread, otherwise it is a user thread. package org.kodejava.lang; public class ThreadCheckDaemon implements Runnable { public static void main(String[] args) { Thread […]
A daemon thread is simply a background thread that is subordinate to the thread that creates it, so when the thread that created the daemon thread ends, the daemon thread dies with it. A thread that is not a daemon thread is called a user thread. To create a daemon thread, call setDaemon() method with […]
Here is another example that use the Thread.sleep() method. In the example we create two instances of the ThreadSleepAnotherDemo, we give each thread a name and the sleep interval so that we can see how to thread execution. package org.kodejava.lang; import java.util.Calendar; public class ThreadSleep implements Runnable { private final String threadName; private final long […]
Capturing groups are numbered by counting the opening parentheses from left to right. To find out how many groups are present in the expression, call the groupCount() method on a matcher object. The groupCount() method returns an int showing the number of capturing groups present in the matcher’s pattern. package org.kodejava.example.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; […]
This example show you how to attach quantifier to character classes or capturing group in regular expressions. package org.kodejava.example.regex; import java.util.regex.Pattern; import java.util.regex.Matcher; public class CombineWithQuantifier { public static void main(String[] args) { // [abc]{3} –> apply quantifier in character class. // Find 'a' or 'b' or 'c', three times in a row. // // […]
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