Objects
一、总结
二、equals
Object的equals方法容易抛空指针异常,应使用常量或确定有值的对象来调用equals
public static boolean equals(Object obj, Object obj1) {
return obj == obj1 || obj != null && obj.equals(obj1);
}
1.调用equals方法时,通常将常量放在左侧,调用常量的equals方法,防止变量为空
2.使用上面的方法,常量作为第一个参数
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