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@ -182,8 +182,10 @@ public static void readFileContent(String filePath) throws IOException {
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```java
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public static void main(String[] args) throws IOException, ClassNotFoundException {
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A a1 = new A(123, "abc");
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String objectFile = "file/a1";
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ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(objectFile));
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objectOutputStream.writeObject(a1);
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objectOutputStream.close();
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@ -195,6 +197,7 @@ public static void main(String[] args) throws IOException, ClassNotFoundExceptio
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}
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private static class A implements Serializable {
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private int x;
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private String y;
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@ -685,26 +685,26 @@ protected void finalize() throws Throwable {}
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**1. 等价关系**
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(一)自反性
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Ⅰ 自反性
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```java
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x.equals(x); // true
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```
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(二)对称性
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Ⅱ 对称性
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```java
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x.equals(y) == y.equals(x); // true
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```
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(三)传递性
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Ⅲ 传递性
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```java
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if (x.equals(y) && y.equals(z))
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x.equals(z); // true;
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```
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(四)一致性
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Ⅳ 一致性
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多次调用 equals() 方法结果不变
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@ -712,7 +712,7 @@ if (x.equals(y) && y.equals(z))
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x.equals(y) == x.equals(y); // true
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```
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(五)与 null 的比较
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Ⅴ 与 null 的比较
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对任何不是 null 的对象 x 调用 x.equals(null) 结果都为 false
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@ -741,6 +741,7 @@ System.out.println(x == y); // false
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```java
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public class EqualExample {
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private int x;
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private int y;
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private int z;
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@ -30,7 +30,7 @@
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# 一、运行时数据区域
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<div align="center"> <img src="../pics//c9ad2bf4-5580-4018-bce4-1b9a71804d9c.png" width="400"/> </div><br>
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<div align="center"> <img src="../pics//c9ad2bf4-5580-4018-bce4-1b9a71804d9c.png" width="450"/> </div><br>
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## 程序计数器
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@ -40,7 +40,7 @@
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每个 Java 方法在执行的同时会创建一个栈帧用于存储局部变量表、操作数栈、常量池引用等信息。从方法调用直至执行完成的过程,就对应着一个栈帧在 Java 虚拟机栈中入栈和出栈的过程。
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<div align="center"> <img src="../pics//926c7438-c5e1-4b94-840a-dcb24ff1dafe.png" width="450"/> </div><br>
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<div align="center"> <img src="../pics//926c7438-c5e1-4b94-840a-dcb24ff1dafe.png" width="500"/> </div><br>
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可以通过 -Xss 这个虚拟机参数来指定每个线程的 Java 虚拟机栈内存大小:
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@ -1433,7 +1433,8 @@ public boolean IsPopOrder(int[] pushSequence, int[] popSequence) {
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Stack<Integer> stack = new Stack<>();
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for (int pushIndex = 0, popIndex = 0; pushIndex < n; pushIndex++) {
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stack.push(pushSequence[pushIndex]);
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while (popIndex < n && stack.peek() == popSequence[popIndex]) {
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while (popIndex < n && !stack.isEmpty()
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&& stack.peek() == popSequence[popIndex]) {
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stack.pop();
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popIndex++;
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}
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