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Programming Articles
Page 1519 of 2547
DoubleStream empty() method in Java
The empty() method of the DoubleStream class in Java returns an empty sequential DoubleStream.The syntax is as follows:static DoubleStream empty()To use the DoubleStream class in Java, import the following package:import java.util.stream.DoubleStream;Let us create an empty DoubleStream:DoubleStream doubleStream = DoubleStream.empty();Now, let us check the number of elements in the stream. It will be 0, since the stream is set to empty:doubleStream.count()The following is an example to implement DoubleStream empty() method in Java:Exampleimport java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.empty(); System.out.println("Number of elements in the stream = ...
Read MoreLongStream min() method in Java
The min() method of the LongStream class in Java returns an OptionalLong describing the minimum element of this stream, or an empty optional if this stream is empty.The syntax is as follows:OptionalLong min()Here, OptionalLong is a container object which may or may not contain a long value.To use the LongStream class in Java, import the following package:import java.util.stream.LongStream;The following is an example to implement LongStream min() method in Java. The isPresent() method of the OptionalLong class returns true if the value is present:Exampleimport java.util.*; import java.util.stream.LongStream; public class Demo { public static void main(String[] args) { ...
Read MoreDoes main() method accept arguments other than string array, in java?
The public static void main() method accepts an array of values of the type String Java from the user.public class{ public static void main(String[] args){ } }You can pass them at the time of execution right after the class name separated with spaces as −java ClassName 10 20 30And, in the program (from the main method) you can extract these values from the String array and use.ExampleFor example, you can use command line arguments to pass a and b in the above program as −public class Sample { public static void main(String[] args){ int ...
Read MorePass long parameter to an overloaded method in Java
Method overloading in a class contains multiple methods with the same name but the parameter list of the methods should not be the same. One of these methods can have a long parameter in their parameter list.A program that demonstrates this is given as follows −Exampleclass PrintValues { public void print(int val) { System.out.println("The int value is: " + val); } public void print(long val) { System.out.println("The long value is: " + val); } } public class Demo { public static void main(String[] args) { PrintValues ...
Read MoreDoubleStream sequential() method in Java
The sequential() method of the DoubleStream class returns an equivalent stream that is sequential.The syntax is as followsDoubleStream sequential()To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create a DoubleStream and add some elementsDoubleStream doubleStream1 = DoubleStream.of(45.8, 67.9, 78.5, 90.6, 97.4);Now create an equivalent stream that is sequentialDoubleStream doubleStream2 = doubleStream1.sequential();The following is an example to implement DoubleStream sequential() method in JavaExampleimport java.util.*; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { DoubleStream doubleStream1 = DoubleStream.of(45.8, 67.9, 78.5, 90.6, 97.4); DoubleStream doubleStream2 = doubleStream1.sequential(); System.out.println("Equivalent ...
Read MoreJava Program to insert a value to a SortedSet
Let’s say we have the following SortedSet −SortedSet set = new TreeSet(); set.add("T"); set.add("R"); set.add("S"); set.add("Q"); set.add("V"); set.add("U"); set.add("W");Now, after displaying the above elements with Iterator, you can insert values like this to a SortedSetset.add("Z"); set.add("Y");Exampleimport java.util.Iterator; import java.util.SortedSet; import java.util.TreeSet; public class Demo { public static void main(String[] argv) throws Exception { SortedSet set = new TreeSet(); set.add("T"); set.add("R"); set.add("S"); set.add("Q"); set.add("V"); set.add("U"); set.add("W"); Iterator i = set.iterator(); ...
Read MoreDoubleStream min() method in Java
The min() method of the DoubleStream class returns an OptionalDouble describing the minimum element of this stream, or an empty OptionalDouble if this stream is empty.The syntax is as follows:OptionalDoublemin()Here, OptionalDouble is a container object which may or may not contain a double valueTo use the DoubleStream class in Java, import the following package:import java.util.stream.DoubleStream;Create a DoubleStream and add elements to the stream:DoubleStream doubleStream = DoubleStream.of(67.9, 89.9, 10.5, 95.8, 49.6);Get the maximum element from the DoubleStream:OptionalDouble res = doubleStream.max();The following is an example to implement DoubleStream min() method in Java:Exampleimport java.util.OptionalDouble; import java.util.stream.DoubleStream; public class Demo { public static ...
Read MoreChecking if a HashSet contains certain value in Java
Let’s say the following is our Integer array −Integer arr[] = { 50, 100, 150, 200, 250, 300 };Set the above integer array in HashSet −Setset = new HashSet(Arrays.asList(arr));Now, let us check whether the HashSet contains certain value or not −set.contains(150)TRUE is returned if the value is in the List, else FALSE is the return value.Exampleimport java.util.Arrays; import java.util.HashSet; import java.util.Set; public class Demo { public static void main(String[] a) { Integer arr[] = { 50, 100, 150, 200, 250, 300 }; Setset = new HashSet(Arrays.asList(arr)); System.out.println(set.contains(200)); ...
Read MoreCan we change return type of main() method in java?
The public static void main() method is the entry point of the Java program. Whenever you execute a program in Java, the JVM searches for the main method and starts executing from it.You can write the main method in your program with return type other than void, the program gets compiled without compilation errors. But, at the time of execution JVM does not consider this new method (with return type other than void) as the entry point of the program.It searches for the main method which is public, static, with return type void, and a String array as an argument.public static int ...
Read MoreMake a Hashtable read-only in Java
Read-only Hashtable would mean users won’t be able to add or remove elements from it. Let us first create a Hashtable with key-value pair −Hashtablehash = new Hashtable(); hash.put("1", "A"); hash.put("2", "B"); hash.put("3", "C"); hash.put("4", "D"); hash.put("5", "E"); hash.put("6", "F"); hash.put("7", "G");Now, use unmodifiableMap() to form a Hashtable read-only −Mapm = Collections.unmodifiableMap(hash);Exampleimport java.util.Collections; import java.util.Hashtable; import java.util.Map; public class Demo { public static void main(String[] s) { Hashtablehash = new Hashtable(); hash.put("1", "A"); hash.put("2", "B"); hash.put("3", "C"); hash.put("4", "D"); hash.put("5", "E"); ...
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