请用Java实现一个算法：由a-z、0-9组成3位的字符密码，并打印所有可能的密码组合。

作为初学者，以下实现方法可能笨拙或有误，希望有大神看到后给予优化和指点！~

public class Password {

	public static void main(String[] args) {
		
		char[] word = new char[]{'a','b','c','d','e','f','g','h','i','g','k','l'
								,'m','n','o','p','q','r','s','t','u','v','w','x',
								'y','z','1','2','3','4','5','6','7','8','9','0'};
		
		char [] password = new char[3];
		
		for (int i = 0;i <= 35;i++) {
			
			password[0] = word[i];
				
				for (int j = 0;j <= 35;j++) {
					
					password[1] = word[j];
					
					for (int k = 0;k <= 35;k++) {
						
						password[2] = word[k];
						
						System.out.println(Arrays.toString(password));
					}
					
				}
		}
		
	}

}