Java Random Int randomInt(int fromInclusive, int toExclusive)

Description

random Int

License

Apache License

Declaration

public static int randomInt(int fromInclusive, int toExclusive) 

Method Source Code

//package com.java2s;
/*//  w  w  w.  j  av  a 2  s .c o  m
Copyright (c) 2012 IBM Corp.
    
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    
http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

public class Main {
    public static int randomInt(int fromInclusive, int toExclusive) {
        for (int i = 0; i < 1000; ++i) {
            int val = (int) Math.floor(Math.random() * (toExclusive - fromInclusive)) + fromInclusive;
            //I'm worried that the floating point approx to .99999 * 60453 (whatever) will hit toExclusive
            if (val >= fromInclusive && val < toExclusive) {
                return val;
            }
        }
        throw new Error("Cannot generate random number in [" + fromInclusive + ", " + toExclusive + ")");
    }
}

Related

1. randomInt(double arg)
2. randomInt(final int max)
3. randomInt(final int min, final int max)
4. randomInt(final int upToNotInclusive)
5. randomInt(int ceil)
6. randomInt(int in)
7. randomInt(int low, int high)
8. randomInt(int min, int max)
9. randomInt(int mn, int mx)