AssignIntegerBetweenMinAndMax.java

import java.util.ArrayList;
import java.util.List;

public class AssignIntegerBetweenMinAndMax {

    public static void main(String[] args) {

        Block block = new Block();

        block.setMin(10);
        block.setMax(15);
        block.addKey("A");

        logBlock("01", block);

        block.addKey("B");
        logBlock("02", block);

        block.addKey("C");
        logBlock("03", block);

        block.addKey("D");
        logBlock("04", block);

        block.addKey("E");
        logBlock("05", block);

    }

    private static class Block {

        private List<String> keys = new ArrayList<String>();

        private long min;

        private long max;

        public Block() {
        }

        public Block(String key, long min, long max) {
            keys.add(key);
            this.min = min;
            this.max = max;
        }

        public String getLastKey() {
            return keys.get(keys.size() - 1);
        }

        public void addInfo(String key, long min, long max) {
            keys.add(key);
            this.min = min;
            this.max = max;
        }

        public void addKey(String s) {
            keys.add(s);
        }

        public List<String> getDat() {
            return keys;
        }

        public long getMin() {
            return min;
        }

        public long getMax() {
            return max;
        }

        public void setMin(long min) {
            this.min = min;
        }

        public void setMax(long max) {
            this.max = max;
        }

        public boolean isAsinable() {
            return getIncrement() > 0;
        }

        public long getIncrement() {
            double inc =
                    (getMax() - getMin())
                            /
                            (double)(keys.size() + 1);
            return inc < 1 ? 0 : Math.round(inc);
        }

        public List<String> asigne() {
            List<String> ret = new ArrayList<>();
            long order = getMin();
            final long inc = getIncrement();
            for (String key : keys) {
                order += inc;
                ret.add(String.format("key=%s, val=%d", key, order));
            }
            return ret;
        }

        @Override
        public String toString() {
            return String.format("keys=%s, size=%d, min=%d, max=%d", keys.toString(), keys.size(), (int) min, (int) max);
        }

    }

    private static void logBlock(String test, Block block) {
        log("*+ " + test + " **");
        log(block.toString());
        log(block.isAsinable());
        if (block.isAsinable()) {
            log(block.asigne());
        }
    }


    public static void log(Object obj) {
        System.out.println(obj.toString());
    }

}

*+ 01 **
keys=[A], size=1, min=10, max=15
true
[key=A, val=13]
*+ 02 **
keys=[A, B], size=2, min=10, max=15
true
[key=A, val=12, key=B, val=14]
*+ 03 **
keys=[A, B, C], size=3, min=10, max=15
true
[key=A, val=11, key=B, val=12, key=C, val=13]
*+ 04 **
keys=[A, B, C, D], size=4, min=10, max=15
true
[key=A, val=11, key=B, val=12, key=C, val=13, key=D, val=14]
*+ 05 **
keys=[A, B, C, D, E], size=5, min=10, max=15
false