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Programming Articles
Page 1500 of 2547
Sort items in a Java TreeSet
First, create a TreeSet and add elements to it −TreeSet set = new TreeSet(); set.add("65"); set.add("45"); set.add("19"); set.add("27"); set.add("89"); set.add("57");Now, sort it in ascending order, which is the default −Iterator i = set.iterator(); while(i.hasNext()){ System.out.println(i.next()); }If you want to sort in descending order, then use the descendingIterator() method −Iterator j = set.descendingIterator(); while(j.hasNext()) { System.out.println(j.next()); }The following is an example to sort items in a TreeSet in ascending and descending order −Exampleimport java.util.*; public class Demo { public static void main(String args[]){ TreeSet set = ...
Read MoreHow to display numbers in scientific notation in Java?
To display number in scientific notation, create NumberFormat object first −NumberFormat numFormat = newDecimalFormat();Now, let’s say you need to format the minimum value of Integer −int i = Integer.MIN_VALUE; System.out.println(i); numFormat = newDecimalFormat("0.######E0"); System.out.println(numFormat.format(i)); numFormat = newDecimalFormat("0.#####E0"); System.out.println(numFormat.format(i));Above, we have used format() method of the NumberFormat class.Exampleimport java.text.DecimalFormat; import java.text.NumberFormat; public class Demo { public static void main(String args[]) { NumberFormat numFormat = new DecimalFormat(); int i = Integer.MIN_VALUE; System.out.println(i); numFormat = new DecimalFormat("0.######E0"); System.out.println(numFormat.format(i)); numFormat = new DecimalFormat("0.#####E0"); ...
Read MoreByteBuffer allocate() method in Java
A new ByteBuffer can be allocated using the method allocate() in the class java.nio.ByteBuffer. This method requires a single parameter i.e. the capacity of the buffer. It returns the new ByteBuffer that is allocated. If the capacity provided is negative, then the IllegalArgumentException is thrown.A program that demonstrates this is given as follows −Exampleimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { ByteBuffer buffer = ByteBuffer.allocate(n); buffer.put((byte)1); buffer.put((byte)2); ...
Read MoreWhat are the modifiers allowed for methods in an Interface in java?
An interface in Java is a specification of method prototypes. Whenever you need to guide the programmer or, make a contract specifying how the methods and fields of a type should be you can define an interface.In Java 7As of Java7 you can have only public, abstract as modifiers for the methods of an interface.interface MyInterface{ public abstract void display(); public abstract void setName(String name); public abstract void setAge(int age); }Using any other modifier with the methods of an interface would lead to a compile time error.From Java8From Java8 onwards interfaces ...
Read MoreByteBuffer asFloatBuffer() method in Java
A view of the ByteBuffer can be created as a FloatBuffer using the asFloatBuffer() method in the class java.nio.ByteBuffer. This method requires no parameters and it returns a float buffer as required. This buffer reflects the changes made to the original buffer and vice versa.A program that demonstrates this is given as follows −Exampleimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 50; try { ByteBuffer bufferB = ByteBuffer.allocate(n); FloatBuffer bufferF = bufferB.asFloatBuffer(); ...
Read MoreDoubleStream of() method in Java
The DoubleStream class in Java the following two forms of the of() methodThe following of() method returns a sequential DoubleStream containing a single element. Here is the syntaxstatic DoubleStream of(double t)Here, parameter t is the single element.The following of() method returns a sequential ordered stream whose elements are the specified valuesstatic DoubleStream of(double… values)Here, the parameter values are the elements of the new stream.To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;The following is an example to implement DoubleStream of() method in JavaExampleimport java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { ...
Read MoreHow to extract multiple integers from a String in Java?
Let’s say the following is our string with integer and characters −String str = "(29, 12; 29, ) (45, 67; 78, 80)";Now, to extract integers, we will be using the following pattern −\dWe have set it with Pattern class −Matcher matcher = Pattern.compile("\d+").matcher(str);Exampleimport java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Demo { public static void main(String[] args) { String str = "(29, 12; 29, ) (45, 67; 78, 80)"; Matcher matcher = Pattern.compile("\d+").matcher(str); Listlist = new ArrayList(); while(matcher.find()) { list.add(Integer.parseInt(matcher.group())); } System.out.println("Integers = "+list); } }OutputIntegers = [29, 12, 29, 45, 67, 78, 80]
Read MoreDoes Java support multiple inheritance? Why? How can we resolve this?
Whenever, you extend a class a copy of superclass’s members is available to the subclass object and, when you can call the method of the superclass using the object of the subclass.ExampleIn the following example, we have a class named SuperClass with a method with name demo(). We are extending this class with another class (SubClass).Now, you create an object of the subclass and call the method demo().class SuperClass{ public void demo() { System.out.println("demo method"); } } public class SubClass extends SuperClass { public static ...
Read MoreByteBuffer asIntBuffer() method in Java
A view of the ByteBuffer can be created as an IntBuffer using the asIntBuffer() method in the class java.nio.ByteBuffer. This method requires no parameters and it returns an int buffer as required. This buffer reflects the changes made to the original buffer and vice versa.A program that demonstrates this is given as follows −Exampleimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 50; try { ByteBuffer bufferB = ByteBuffer.allocate(n); IntBuffer bufferI = bufferB.asIntBuffer(); ...
Read MoreGetting a subvector from a vector in C++
This is a C++ program for getting a subvector from a vector in C++AlgorithmBegin Declare s as vector s(vector const &v, int m, int n) to initialize start and end position of vector to constructor. auto first = v.begin() + m. auto last = v.begin() + n + 1. Declare a variable vector of vector type. Pass the value of first and last position of vector. Return vector. Declare a template T. Declare a function show(). ...
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