I need a data type that behaves completely like Integer with this difference that I want it to overflow and underflow to certain values. On the other words, I'd like to set the MAX_VALUE and MIN_VALUE of an object/instance of the Integer class. The problem is MAX_VALUE and MIN_VALUE are constant and Integer class in final. How should I approach?
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2 Answers
You'll have to create your own wrapper class:
public class CustomInteger
{
public static final int MAX_VALUE = 5000;
public static final int MIN_VALUE = -5000;
private final int value;
public CustomInteger(int value)
{
// TODO: Validation
this.value = value;
}
// Add all the methods you want - e.g. integer operations etc
// performing custom overflow/underflow on each operation
}
You need to decide whether you want one fixed pair of limits for the whole type, or whether each instance can have a different limit (and what that means when adding together two values with different limits etc).
Since java.lang.Integer is final you cannot extend it. The only choice is to wrap it:
public class LimitedInteger {
private int value;
private int min;
private int max;
LimitedInteger() {
}
LimitedInteger(int value) {
this.value = value;
}
LimitedInteger(int value, int min, int max) {
this.value = value;
this.min = min;
this.max = max;
}
}
etc, etc
