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@ -131,7 +131,7 @@ if x.equals(y) && y.equals(z) {
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多次调用 equals() 方法结果不变
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```java
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x.equals(y) == x.equals(y) == x.equals(y) == x.equals(y); // true
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x.equals(y) == x.equals(y); // true
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```
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**5. 与 null 的比较**
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