自己寫了一個，有時候會有需要。

public static <V> boolean isEmpty(ArrayList<V> sourceList) {
        return (sourceList == null || sourceList.size() == 0);
    }

/**
     * 打亂ArrayList
     * 
     * */
    public static <V> ArrayList<V> randomList(ArrayList<V> sourceList){
    	if (isEmpty(sourceList)) {
            return sourceList;
        }
    	
    	ArrayList<V> randomList = new ArrayList<V>( sourceList.size( ) );
    	do{
    		int randomIndex = Math.abs( new Random( ).nextInt( sourceList.size() ) );
        	randomList.add( sourceList.remove( randomIndex ) );
    	}while( sourceList.size( ) > 0 );
    	
    	return randomList;
    }