在Java中,当使用Lombok的@Data注解或者手动生成equals和hashCode方法时,如果不适当处理父类的调用,可能会遇到“generating equals/hashcode implementation but without a call to superclass”的警告。这个问题主要发生在子类继承自一个包含需要被比较或哈希的字段的父类时。以下是针对这个问题的详细解答,包含解决方案和代...
package com.cxh.test1; import java.util.HashMap; import java.util.HashSet; import java.util.Set; class People{ private String name; private int age; public People(String name,int age) { this.name = name; this.age = age; } public void setAge(int age){ this.age = age; } @Override...
// This is probably the best overall implementation -- we'll // likely make this the default in future releases. unsigned t = Self->_hashStateX ; t ^= (t << 11) ; Self->_hashStateX = Self->_hashStateY ; Self->_hashStateY = Self->_hashStateZ ; Self->_hashStateZ = Self-...
Hash collision methodologies show in a nutshell why it’s so important to implementhashCode()efficiently. Java 8 brought an interestingenhancement toHashMapimplementation. If a bucket size goes beyond the certain threshold, a tree map replaces the linked list. This allows achievingO(logn)lookup ins...
// This is probably the best overall implementation -- we'll // likely make this the default in future releases. unsigned t = Self->_hashStateX ; t ^= (t << 11) ; Self->_hashStateX = Self->_hashStateY ; Self->_hashStateY = Self->_hashStateZ ; ...
Generating equals/hashCode implementation but without a call to superclass, even though this class does not extend java.lang.Object. If this is intentional, add '(callSuper=false)' to your type. @Data//当子类继承父类之后 如果存在相同属性则会出现此问题 ...
// This is probably the best overall implementation -- we'll // likely make this the default in future releases. unsigned t = Self->_hashStateX; t ^= (t << 11); Self->_hashStateX = Self->_hashStateY; Self->_hashStateY = Self->_hashStateZ; ...
addressofthe object into an integer,butthisimplementation technique is not required by the JavaTMprogramming language.) 但是了解jvm的同学肯定知道,不管是标记复制算法还是标记整理算法,都会改变对象的内存地址。鉴于jvm重定位对象地址,但该hashCode又不能变化,那么该值一定是被保存在对象的某个地方了。 我们推测,...
确保当前线程是个JavaThread * 3. 确保当前线程没有被block */ assert (Universe::verify_...
* address of the object into an integer, but this implementation * technique is not required by the * Java programming language.) * * @return a hash code value for this object. * @see java.lang.Object#equals(java.lang.Object) * @see java.lang.System#identityHashCode ...