vincentgoodturtle的博客

Extends is used when you want attributes of parent class/interface in your child class/interfaceImplements is used when you want attributes of an interface in your class.class Parent{}class Chil...

public class A{} 表示 class A是公用類 , public擁有最大的訪問權限class A{} 表示class A只能同包(package)使用public int method(){ return } 必須有return 字句因為有返回類型intclass類不會有 public int class 或者 public void class 因為class是一個創造對...

import java.util.Arrays;int [] abc = {1,2,3,4}System.out.println(Arrays.toString(abc));

package test;public class test2 { public static void main(String[] args) { // TODO Auto-generated method stub test2 abc = new test2(); System.out.println(abc.getClass()); }}

package Stack;import java.util.Stack;public class Try { public static void main(String[] args) { // TODO Auto-generated method stub Stack <Integer >stack = new Stack (); stack.push(9...

有時侯一個function已經設定了return type which is Node in this case.如果想要報錯並返回一個非Node的東西時就 return nullpublic Node min_node() { if (root == null) { System.out.println("root not exists"); return null; //...

叶子节点没有子节点

import java.util.Stack;public class BinarySearchTree { public Node root; //初始化 Node class // public Node find(int key) { //創建method "find" with data type being Node// // } //中序遍歷 public ...

class MyStack {/** Initialize your data structure here. */public MyStack() { Queue <> q = new Linkedlist <>;}/** Push element x onto stack. */public void push(int x) { q.poll...

A class that is declared using the abstract keyword is known as abstract class. Abstraction is a process of hiding the data implementation details, and showing only functionality to the user. Abstract...

背代碼沒有用多刷LeetCode一些復雜的算法如紅黑樹, KMP不用知道如何去實現, 需