Collection of null-safe methods, consisting of a few `isEmpty()` checks and a `equals()` check

NullSafe.java

import java.util.Collection;
import java.util.Map;

public class NullSafe {
    
    public static boolean isEmpty(Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    public static boolean isEmpty(Map<?, ?> map) {
        return map == null || map.isEmpty();
    }

    public static boolean isEmpty(CharSequence chars) {
        return chars == null || chars.length() == 0;
    }


    /**
     * Taken from java.util.Objects 
     */
    public static boolean equals(Object a, Object b) {
        return (a == null) ? (b == null) : a.equals(b);
    }
}