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basic language utils

There is a newer version: 1.0.9

package net.dongliu.commons.lang;

/**
 * @author Dong Liu
 */
public class Requires {

    /**
     * if o is null, throw nullPointerException; else return o
     */
    public static  T notNull(T o) {
        if (o == null) {
            throw new NullPointerException();
        }
        return o;
    }
}