boolean equals(Object obj) void write(int b) String getActions 描述 所述java.io.FileOutputStream.equals(Object OBJ)方法检查是否相等2个FilePermission对象。验证obj是否为FilePermission,并且具有与此对象相同的路径名和操作。 声明 以下是java.io.FilePermission.equals(Object obj)方法的声明 public boolean equals(Object obj) 参数 obj - 要与此对象进行相等性测试的对象。 返回值 如果obj是FilePermission,并且该路径名和操作与此对象相同,则此方法返回true。 异常 NA 实例 以下示例显示了java.io.FilePermission.equals(Object obj)方法的用法。 package com.tutorialspoint; import java.io.FilePermission; import java.io.IOException; public class FilePermissionDemo { public static void main(String[] args) throws IOException { FilePermission fp = null; FilePermission fp1 = null; FilePermission fp2 = null; FilePermission fp3 = null; boolean bool = false; try { // create new file permissions fp = new FilePermission("C://test.txt", "read"); fp1 = new FilePermission("C://test1.txt", "read"); fp2 = new FilePermission("C://test.txt", "write"); fp3 = new FilePermission("C://test.txt", "read"); // checks two file permission objects for equality bool = fp.equals(fp1); // prints System.out.println(bool); // checks two file permission objects for equality bool = fp.equals(fp2); // prints System.out.println(bool); // checks two file permission objects for equality bool = fp.equals(fp3); // prints System.out.print(bool); } catch(Exception ex) { // if an error occurs ex.printStackTrace(); } finally { } } } 让我们编译并运行上面的程序,这将产生以下结果 false false true void write(int b) String getActions