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Ints Class in Java
The Ints class is a utility class for primitive type int. Let us see the class declaration −
@GwtCompatible public final class Ints extends Object
Example
Let us see an example of one of the methods to perform concatenation. The concat() function in Ints class is used to concatenate the arrays passed as parameter −
import com.google.common.primitives.Ints;
import java.util.*;
class Demo {
public static void main(String[] args) {
int[] myArr1 = { 100, 150, 230, 300, 400 };
int[] myArr2 = { 450, 550, 700, 800, 1000 };
System.out.println("Array 1 = ");
for(int i=0; i < myArr1.length; i++) {
System.out.println(myArr1[i]);
}
System.out.println("Array 2 = ");
for(int i=0; i < myArr2.length; i++) {
System.out.println(myArr2[i]);
}
int[] arr = Ints.concat(myArr1, myArr2);
System.out.println("Concatenated arrays = "+Arrays.toString(arr));
}
}Output
Array 1 = 100 150 230 300 400 Array 2 = 450 550 700 800 1000 Concatenated arrays = [100, 150, 230, 300, 400, 450, 550, 700, 800, 1000]
Example
Let us see another example −
import java.util.List;
import com.google.common.primitives.Ints;
public class GuavaTester {
public static void main(String args[]) {
GuavaTester tester = new GuavaTester();
tester.testInts();
}
private void testInts() {
int[] intArray = {1,2,3,4,5,6,7,8,9};
//convert array of primitives to array of objects
List<Integer> objectArray = Ints.asList(intArray);
System.out.println(objectArray.toString());
//convert array of objects to array of primitives
intArray = Ints.toArray(objectArray);
System.out.print("[ ");
for(int i = 0; i < intArray.length ; i++) {
System.out.print(intArray[i] + " ");
}
System.out.println("]");
//check if element is present in the list of primitives or not
System.out.println("5 is in list? " + Ints.contains(intArray, 5));
//Returns the minimum
System.out.println("Min: " + Ints.min(intArray));
//Returns the maximum
System.out.println("Max: " + Ints.max(intArray));
//get the byte array from an integer
byte[] byteArray = Ints.toByteArray(20000);
for(int i = 0; i < byteArray.length ; i++) {
System.out.print(byteArray[i] + " ");
}
}
}Output
[1, 2, 3, 4, 5, 6, 7, 8, 9] [ 1 2 3 4 5 6 7 8 9 ] 5 is in list? true Min: 1 Max: 9 0 0 78 32
Updated on: 24-Sep-2019
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