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double abs(double d)
float abs(float f)
int abs(int i)
long abs(long lng)

public class Test{ 
    public static void main(String args[]){
        Integer a = -8;
        double d = -100;
        float f = -90f;        

        System.out.println(Math.abs(a));
        System.out.println(Math.abs(d));     
        System.out.println(Math.abs(f));     
    }
}

8
100.0
90.0