CREATE SEQUENCE (fast i java)

public class Test {
	
	static int PK = 1000; 
	
	Test () {
		this.PK = PK + 1;
	}
	
	public static void main(String [] args) {
			Test y1 = new Test();
			System.out.println(y1.PK);
			Test y2 = new Test();
			System.out.println(y2.PK);
	}	
}

/**
Copyright 2020 a-mortal

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**/

public class SQLSequence
	implements java.util.Iterator<Integer>, Iterable<Integer>
{
	
	public static final boolean NOCYCLE = false, CYCLE = true;
	
	private int currentValue;
	private int initialValue;
	private int incrementValue;
	private int maximumValue;
	private boolean cycleType;
	private boolean hasNextValue = true;
	
	public SQLSequence (
		int initial_value,
		int increment_value,
		int maximum_value,
		boolean cycle_type
	) {
		if (initial_value > maximum_value)
			throw new IllegalArgumentException(
			"The maximum must be higher or equal to the inital value.");
		if (increment_value < 1)
			throw new IllegalArgumentException(
			"The increment value must be greater than zero.");
		
		initialValue = initial_value;
		incrementValue = increment_value;
		maximumValue = maximum_value;
		cycleType = cycle_type;
		
		currentValue = initialValue;
	}
	
	public final boolean hasNext() {
		return hasNextValue;
	}
	
	public final Integer next() {
		int x = currentValue;
		if (currentValue < maximumValue) currentValue++;
		else if (cycleType) currentValue = initialValue;
		else hasNextValue = false;
		return x;
	}
	
	public final void remove() { }
	
	public java.util.Iterator<Integer> iterator() {
		return this;
	}
	
}

public class Test {
	
	public static void main(String[] args) {
		Iterable<Integer> sequence = new SQLSequence(
			1000, 1, 1010,  SQLSequence.NOCYCLE
		);
		for (Integer i : sequence) {
			System.out.println(i);
		}
	}
	
}

public class Test {
	
	static int PK = 1000; 
	
	Test () {
		this.PK = PK + 1;
	}
	
	public static void main(String [] args) {
			Test y1 = new Test();
			Test y2 = new Test();
			System.out.println(y1.PK);
			System.out.println(y2.PK);
	}	
}

public class Test {
	
	private static int PKIncrement = 1000;
	public int PK; 
	
	Test () {
		this.PK = PKIncrement++;
	}
	
	public static void main(String [] args) {
			Test y1 = new Test();
			Test y2 = new Test();
			System.out.println(y1.PK);
			System.out.println(y2.PK);
	}	
}

if (currentValue < maximumValue) currentValue++;

if (currentValue < maximumValue) currentValue += incrementValue;

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