java实现简单map

package StudyMap;

/**
 * 实现简单的map
 * 效率低
 */
import javax.crypto.interfaces.PBEKey;

public class StudyMap {
    keyAssignments[] arry = new keyAssignments[100];
    private int size;
    
    // put()
    public void put( Object key,Object value ) {
        keyAssignments temp = new keyAssignments( key,value);
        arry[size] = temp;
        size++;
    }
    
    // get() 根据key返回对应的value
    public Object get( Object key ) {
        for ( int i = 0; i < size; i++) {
            if ( arry[i].key.equals( key)) {
                return ( Object) arry[i].value;
            }
        }
        return null;
    }
    
    // size()
    public Object size() {
        return ( Object) size;
    }
    
    // forEach()
    public void forEach() {
        for ( int i = 0; i < size; i++) {
            System.out.println( arry[i].key + ":" + arry[i].value);
        }
    }
    
    // 简单的remove方法
    public void remove( Object key ) {
        for ( int i = 0; i < size; i++) {
            if ( arry[i].key.equals( key)) {
                arry[i].value = null;
                arry[i].key = null;
            }
            
        }
    }
    
    public static void main( String[] args ) {
        StudyMap eMap = new StudyMap();
        eMap.put( "妞妞","端午");
        eMap.put( "过儿","姑姑");
        eMap.put( 111,222);
        System.out.println( eMap.get( "妞妞"));
        System.out.println( eMap.get( 111));
        System.out.println( eMap.size());
        eMap.forEach();
        eMap.remove( "妞妞");
        eMap.forEach();
        
    }
}

class keyAssignments {
    Object key;
    Object value;
    
    public keyAssignments( Object key,Object value ) {
        super();
        this.key = key;
        this.value = value;
    }
}