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Java - random integer number in range with exclusive max value example
4 points
In this short article we want to show how in Java randomize integer number in range with exclusive max value.
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package com.dirask.examples;2
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public class RandomUtil {4
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public static int randomize() throws Exception {6
return randomize(Integer.MAX_VALUE);7
}8
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public static int randomize(int max) throws Exception {10
return randomize(0, max);11
}12
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public static int randomize(int min, int max) throws Exception {14
if(min > max - 1) {15
throw new Exception("Incorrect arguments.");16
}17
return (int) (min + (max - min) * Math.random());18
}19
}Usage example:
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package com.dirask.examples;2
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public class Program {4
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public static void main(String[] args) throws Exception {6
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System.out.println( RandomUtil.randomize() ); // 55473826243221398
System.out.println( RandomUtil.randomize( 5 ) ); // 39
System.out.println( RandomUtil.randomize( 10, 80 ) ); // 6210
System.out.println( RandomUtil.randomize(-50, 50 ) ); // -811
} 12
}
