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Articles on Trending Technologies
Technical articles with clear explanations and examples
Java 8 Stream Terminal Operations
Streams in Java have a few terminal operations. They are as follows −collect − The collect method returns the outcome of the intermediate operationsList id = Arrays.asList(“Classes", "Methods", "Members"); List output = id.stream().filter(s -> s.startsWith("M")).collect(Collectors.toList());reduce − The reduce method is reduces the elements of a stream into a single element having a certain value after computation. The BinaryOperator is an argument of the reduce method.List list1 = Arrays.asList(11, 33, 44, 21); int even = list1.stream().filter(x -> x % == 0).reduce(0, (ans, i) -> ans+i);forEach − This method iterates through every element in the streamList list1= Arrays.asList(1, 3, 5, 7); List ...
Read MoreBoolean Type in Java
To display Boolean type, firstly take two variables and declare them as boolean.boolean val1, val2;Then one by one assign values to both of them, one of them is shown below −val1 = true;Now, use if statement to check and display the Boolean true value.if(val1) System.out.println("This is true and will get displayed!");Let us now see the complete example to work with Boolean Type in Java.Examplepublic class Demo { public static void main(String[] args) { boolean val1, val2; System.out.println("Boolean Type in Java"); val1 = true; if(val1) ...
Read MoreSwap two variables in one line in Java
In order to swap two variable using single expression or in single line we could use bitwise XOR operator of Java. As we now that in Java XOR functions as XOR of two numbers a and b returns a number which has all the bits as 1 wherever bits of a and b differs. So for swapping of two variable we would use this operator as Example public class SwapUsingBitwise { public static void main(String[] args) { int a = 8 ; int b = 10; ...
Read MoreDisplay time zone with SimpleDateFormat("z") in Java
You can display timezone easily in Java using SimpleDateFormat(“z”).Firstly, to work with SimpleDateFormat class in Java, import the following package −import java.text.SimpleDateFormat;Now, set the format with SimpleDateFormat(“z”) to display timezone −Format f = new SimpleDateFormat(”z”);Now, get the timezone in a string −String strTimeZone = f.format(new Date());The following is an example −Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public class Demo { public static void main(String[] args) throws Exception { // displaying current date and time Calendar cal = Calendar.getInstance(); ...
Read MorePassing and Returning Objects in Java
As we know it is core concept that in Java there is always pass by value and not by pass by reference.So in this post we will focus on that how this concept get validated in case of passing primitive and passing reference to a method.In case when a primitive type is passed to a method as argument then the value assigned to this primitive is get passed to the method and that value becomes local to that method, which means that any change to that value by the method would not change the value of primitive that you have ...
Read MoreJoin Strings in Java
To join strings in Java, use the String.join() method. The delimiter set as the first parameter in the method is copied for each element.Let’s say we want to join the strings “Demo” and “Text”. With that, we want to set a delimeter $. For that, use the join() method as shown below −String.join("$","Demo","Text");The following is an example.Examplepublic class Demo { public static void main(String[] args) { String str = String.join("$","Demo","Text"); System.out.println("Joined strings: "+str); } }OutputJoined strings: Demo$Text
Read MoreSwapping Characters of a String in Java
For swapping characters of a string in Java we can use string builder which is mutable so we need not to take care of new object creation during swapping. In this we would create a method which swap characters of string based on location of swapping characters.This method will take location of swapping characters as its parameters.First store both characters need to be swapped and using set character method of string builder swap the targeted characters. Example public class SwapCharacters { public static void main(String[] args) { String str = ...
Read MoreJava Program to format date time with Join
To format date time with Join, set the date as a string and do not forget to add the delimeter.For delimeter “/” in the dateString.join("/","11","11","2018");For delimeter “:” in the date.String.join(":", "10","20","20");The following is an example.Examplepublic class Demo { public static void main(String[] args) { String d = String.join("/","11","11","2018"); System.out.print("Date: "+d); String t = String.join(":", "10","20","20"); System.out.println("Time: "+t); } }OutputDate: 11/11/2018 Time: 10:20:20
Read MoreGet the substring after the first occurrence of a separator in Java
We have the following string with a separator.String str = "Tom-Hanks";We want the substring after the first occurrence of the separator i.e.HanksFor that, first you need to get the index of the separator and then using the substring() method get, the substring after the separator.String separator ="-"; int sepPos = str.indexOf(separator); System.out.println("Substring after separator = "+str.substring(sepPos + separator.length()));The following is an example.Examplepublic class Demo { public static void main(String[] args) { String str = "Tom-Hanks"; String separator ="-"; int sepPos = str.indexOf(separator); if (sepPos == -1) { ...
Read MoreJava Program to subtract long integers and check for overflow
To check for Long overflow, we need to check the Long.MAX_VALUE with the subtracted long result. Here, Long.MAX_VALUE is the maximum value of Long type in Java.Let us see an example wherein long integers are subtracted and if the result is still more than the Long.MAX_VALUE, then an exception is thrown −The following is an example showing how to check for Long overflow −Examplepublic class Demo { public static void main(String[] args) { long val1 = 70123; long val2 = 10567; ...
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