a stat bar object with 2 variables cur + max & it also as methods for handling those variables

VideoGameStatClass.java

public class Stat
{
	private double cur = 0;
	private double max = 0;
	public Stat(int max)
	{
		this.max = max;
		cur = max;
	}
	public void add(double num)
	{
		if(cur<=max)cur+=num;
		if(cur>max)cur=max;
	}
	public void sub(double num)
	{
		if(cur>=0)cur-=num;
		if(cur<0)cur=0;
	}
	public void fill()
	{
		cur = max;
	}
	public void refill(double per)
	{
		cur = cur += max/per/100;
		if(cur>max)cur=max;
	}
	public void empty()
	{
		cur = 0;
	}
	public void drop(double per)
	{
		cur = cur -= cur/per/100;
		if(cur<0)cur=0;
	}
	public boolean isFull()
	{
		if(cur==max)return true;
		return false;
	}
	public boolean isEmpty()
	{
		if(cur==0)return true;
		return false;
	}
	public boolean isHalf()
	{
		double range = .1;
		if(cur<max/2+range&&cur>max/2-range)
		{
			return true;
		}
		return false;
	}
	public boolean inRange(double range, double middle)
	{
		if(cur>middle-range&&cur<middle+range)
		{
			return true;
		}
		return false;
	}
	public int getCur(){return (int)cur;}
	public int getMax(){return (int)max;}
}