日期:2014-05-20 浏览次数:20674 次
class People { private String name; private int age; public People(int age, String name) { super(); this.age = age; this.name = name; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; People other = (People) obj; if (age != other.age) return false; if (name == null) { if (other.name != null) return false; } else if (!name.equals(other.name)) return false; return true; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + age; result = prime * result + ((name == null) ? 0 : name.hashCode()); return result; } public static void main(String[] args) { People p1 = new People(16, "张三"); People p2 = new People(16, "张三"); System.out.println(p1); System.out.println(p2); System.out.println(p1==p2); } }
public String toString() { return getClass().getName() + "@" + Integer.toHexString(hashCode()); }
------解决方案--------------------
只是先比较一下地址,如果地址相等自然是同一个对象
然后再用name的字段的equals方法比较如果名字相等来判断
------解决方案--------------------
地址真的是一样的吗?
System.out.println(p1);
打印的不是P1的地址是打印的应该是p1.tostring()的值.
------解决方案--------------------