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Java File Handling The File class from the java.io package, allows us to work with files. import java.io.File; // Import the File class File myObj = n 阅读全文
posted @ 2022-11-27 23:39
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import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<Integer> numbers = new ArrayList<Integer>(); number 阅读全文
posted @ 2022-11-27 23:17
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Threads allows a program to operate more efficiently by doing multiple things at the same time. Creating a Thread There are two ways to create a threa 阅读全文
posted @ 2022-11-27 22:56
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Pattern Class - Defines a pattern (to be used in a search) Matcher Class - Used to search for the pattern PatternSyntaxException Class - Indicates syn 阅读全文
posted @ 2022-11-27 22:36
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try and catch 确切的说这应该是Exception。因为Error是指Java虚拟机无法解决的严重问题，如stack溢出，堆溢出... Use try and catch: 可以写多个catch来捕捉不同的exception类型 public class Main { public st 阅读全文
posted @ 2022-11-27 20:08
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Wrapper classes provide a way to use primitive data types (int, boolean, etc..) as objects. Primitive Data TypeWrapper Class byte Byte short Short int 阅读全文
posted @ 2022-11-27 19:53
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An Iterator is an object that can be used to loop through collections, like ArrayList and HashSet. // Import the ArrayList class and the Iterator clas 阅读全文
posted @ 2022-11-27 19:44
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A HashSet is a collection of items where every item is unique, and it is found in the java.util package: import java.util.HashSet; // Import the HashS 阅读全文
posted @ 2022-11-27 19:32
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A HashMap however, store items in "key/value" pairs, and you can access them by an index of another type (e.g. a String). Create a HashMap object call 阅读全文
posted @ 2022-11-27 19:20
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The LinkedList class is almost identical to the ArrayList: import java.util.LinkedList; public class Main { public static void main(String[] args) { L 阅读全文
posted @ 2022-11-27 07:33
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