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Addition and Concatenation in Java
'+' operator in java can be used to add numbers and concatenate strings. Following rules should be considered.
Only numbers as operands then result will be a number.
Only strings as operands then result will be a concatenated string.
If both numbers and strings as operands, then numbers coming before string will be treated as numbers.
If both numbers and strings as operands, then numbers coming after string will be treated as a string.
Above rule can be overridden using brackets().
Example
Create a java class named Tester.
Tester.java
public class Tester {
public static void main(String args[]) {
//Scenario 1: Only numbers as operands to + operator
System.out.print("Scenario 1: (1 + 2) = ");
System.out.println(1 + 2);
//Scenario 2: Only Strings as operands to + operator
System.out.print("Scenario 2: (\"tutorials\" + \"point.com\") = ");
System.out.println("tutorials" + "points.com");
//Scenario 3: both numbers and strings as operands to + operator
//numbers will be treated as non-text till a string comes
System.out.print("Scenario 3: (1 + 2 + \"tutorials\" + \"point.com\") = ");
System.out.println( 1 + 2 + "tutorials" + "points.com");
//Scenario 4: both numbers and strings as operands to + operator
//if string comes first, numbers will be treated as text.
System.out.print("Scenario 4: (1 + 2 + \"tutorials\" + \"point.com\" + 3 + 4 ) = ");
System.out.println( 1 + 2 + "tutorials" + "points.com" + 3 + 4);
//Scenario 5: both numbers and strings as operands to + operator
//if string comes first, numbers will be treated as text.
//Use brackets to treat all numbers as non-text
System.out.print("Scenario 5: (1 + 2 + \"tutorials\" + \"point.com\" + (3 + 4)) = ");
System.out.println( 1 + 2 + "tutorials" + "points.com" + (3 + 4));
}
}Output
Compile and Run the file to verify the result.
Scenario 1: (1 + 2) = 3
Scenario 2: ("tutorials" + "point.com") = tutorialspoints.com
Scenario 3: (1 + 2 + "tutorials" + "point.com") = 3tutorialspoints.com
Scenario 4: (1 + 2 + "tutorials" + "point.com" + 3 + 4 ) = 3tutorialspoints.com34
Scenario 5: (1 + 2 + "tutorials" + "point.com" + (3 + 4)) = 3tutorialspoints.com7
Updated on: 18-Jun-2020
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