場景:很多accessToken是有有效期的,在有效期後需要重新請求accessToken,此時我們需要把accessToken和有效時間關聯起來,當然此時使用redis是最佳選擇,但如果我們想放在java本地呢?java中常見鍵值對是map,但此時已經不適合了,因爲accessToken和有效期都是變動的,而pair特別適合此場景。
/*
* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javafx.util;
import java.io.Serializable;
import javafx.beans.NamedArg;
/**
* <p>A convenience class to represent name-value pairs.</p>
* @since JavaFX 2.0
*/
public class Pair<K,V> implements Serializable{
/**
* Key of this <code>Pair</code>.
*/
private K key;
/**
* Gets the key for this pair.
* @return key for this pair
*/
public K getKey() { return key; }
/**
* Value of this this <code>Pair</code>.
*/
private V value;
/**
* Gets the value for this pair.
* @return value for this pair
*/
public V getValue() { return value; }
/**
* Creates a new pair
* @param key The key for this pair
* @param value The value to use for this pair
*/
public Pair(@NamedArg("key") K key, @NamedArg("value") V value) {
this.key = key;
this.value = value;
}
/**
* <p><code>String</code> representation of this
* <code>Pair</code>.</p>
*
* <p>The default name/value delimiter '=' is always used.</p>
*
* @return <code>String</code> representation of this <code>Pair</code>
*/
@Override
public String toString() {
return key + "=" + value;
}
/**
* <p>Generate a hash code for this <code>Pair</code>.</p>
*
* <p>The hash code is calculated using both the name and
* the value of the <code>Pair</code>.</p>
*
* @return hash code for this <code>Pair</code>
*/
@Override
public int hashCode() {
// name's hashCode is multiplied by an arbitrary prime number (13)
// in order to make sure there is a difference in the hashCode between
// these two parameters:
// name: a value: aa
// name: aa value: a
return key.hashCode() * 13 + (value == null ? 0 : value.hashCode());
}
/**
* <p>Test this <code>Pair</code> for equality with another
* <code>Object</code>.</p>
*
* <p>If the <code>Object</code> to be tested is not a
* <code>Pair</code> or is <code>null</code>, then this method
* returns <code>false</code>.</p>
*
* <p>Two <code>Pair</code>s are considered equal if and only if
* both the names and values are equal.</p>
*
* @param o the <code>Object</code> to test for
* equality with this <code>Pair</code>
* @return <code>true</code> if the given <code>Object</code> is
* equal to this <code>Pair</code> else <code>false</code>
*/
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o instanceof Pair) {
Pair pair = (Pair) o;
if (key != null ? !key.equals(pair.key) : pair.key != null) return false;
if (value != null ? !value.equals(pair.value) : pair.value != null) return false;
return true;
}
return false;
}
}
pair保持一對鍵值對,使用getKey()和getValue()就能拿到,然後通過判斷有效期進行更新key