史上最全Java面试题整理（附参考答案）

<span class="hljs-meta"&gt;@Override <span class="hljs-function"&gt;<span class="hljs-keyword"&gt;public <span class="hljs-keyword"&gt;int <span class="hljs-title"&gt;hashCode<span class="hljs-params"&gt;() { <span class="hljs-keyword"&gt;final <span class="hljs-keyword"&gt;int prime = <span class="hljs-number"&gt;31; <span class="hljs-keyword"&gt;int result = <span class="hljs-number"&gt;1; result = prime * result + areaCode; result = prime * result + ((lineNumber == <span class="hljs-keyword"&gt;null) ? <span class="hljs-number"&gt;0 : lineNumber.hashCode()); result = prime * result + ((prefix == <span class="hljs-keyword"&gt;null) ? <span class="hljs-number"&gt;0 : prefix.hashCode()); <span class="hljs-keyword"&gt;return result; } <span class="hljs-meta"&gt;@Override <span class="hljs-function"&gt;<span class="hljs-keyword"&gt;public <span class="hljs-keyword"&gt;boolean <span class="hljs-title"&gt;equals<span class="hljs-params"&gt;(Object obj) { <span class="hljs-keyword"&gt;if (<span class="hljs-keyword"&gt;this == obj) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;true; <span class="hljs-keyword"&gt;if (obj == <span class="hljs-keyword"&gt;null) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; <span class="hljs-keyword"&gt;if (getClass() != obj.getClass()) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; PhoneNumber other = (PhoneNumber) obj; <span class="hljs-keyword"&gt;if (areaCode != other.areaCode) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; <span class="hljs-keyword"&gt;if (lineNumber == <span class="hljs-keyword"&gt;null) { <span class="hljs-keyword"&gt;if (other.lineNumber != <span class="hljs-keyword"&gt;null) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; } <span class="hljs-keyword"&gt;else <span class="hljs-keyword"&gt;if (!lineNumber.equals(other.lineNumber)) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; <span class="hljs-keyword"&gt;if (prefix == <span class="hljs-keyword"&gt;null) { <span class="hljs-keyword"&gt;if (other.prefix != <span class="hljs-keyword"&gt;null) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; } <span class="hljs-keyword"&gt;else <span class="hljs-keyword"&gt;if (!prefix.equals(other.prefix)) <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;false; <span class="hljs-keyword"&gt;return <span class="hljs-keyword"&gt;true; }

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