Java考查“==”和equals

/**
 *
 */
package com.you.demo;

/**
 * @author YouHaiDong
 * @date 2015-04-02
 */
public class Welcome
{
	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		String str1 = "you";
		String str2 = "you";
		String str3 = new String("you");
		System.out.println(str1==str2);
		System.out.println(str1==str3);
		System.out.println(str2.equals(str3));
	}

}

结果为：

true
false
true