标签练习下的文章 - 半岛的小屋

2022-01-05

2022年01月05日
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2021-11-29

java project 家庭收支记账软件 {music id="1818128141" color="#1989fa" autoplay="autoplay"/}家庭收支记账软件1. 自己编写的java文件FamilyAccount.java//FamilyAccount.java public class FamilyAccount { public static void main(String[] args) { boolean isFlag = true; String details = "收支\t账户金额\t收支金额\t说明\n"; int balance = 10000; while (isFlag){ System.out.println("-----------------家庭收支记账软件-----------------\n"); System.out.println(" 1 收支明细"); System.out.println(" 2 登记收入"); System.out.println(" 3 登记支出"); System.out.println(" 4 退出\n"); System.out.print(" 请选择(1-4)："); //获取输入 char selection = Utility.readMenuSelection(); switch (selection){ case '1': //1.收支明细 System.out.println("-----------------当前收支明细记录-----------------"); System.out.println(details); System.out.println("--------------------------------------------------"); break; case '2': //2.登记收入 System.out.print("本次收入金额："); int addMoney = Utility.readNumber(); System.out.print("本次收入说明："); String addInfo = Utility.readString(); balance += addMoney; details += ("收入\t" + balance + "\t\t" + addMoney + "\t\t" + addInfo + "\n"); System.out.println("---------------------登记完成---------------------\n"); break; case '3': //3.登记支出 System.out.print("本次支出金额："); int minusMoney = Utility.readNumber(); System.out.print("本次支出说明："); String minusInfo = Utility.readString(); if (balance >= minusMoney){ balance -= minusMoney; details += ("支出\t" + balance + "\t\t" + minusMoney + "\t\t" + minusInfo + "\n"); }else { System.out.println("钱不够，付不了~~~"); } System.out.println("---------------------登记完成---------------------\n"); break; case '4': //4.退出 System.out.print("确认是否退出(Y/N)："); char isExit = Utility.readConfirmSelection(); if (isExit == 'Y'){ isFlag = false; } break; } } } }2. 别人写好的工具类Utility.java//Utility.java import java.util.Scanner; /** Utility工具类：将不同的功能封装为方法，就是可以直接通过调用方法使用它的功能，而无需考虑具体的功能实现细节。 */ public class Utility { private static Scanner scanner = new Scanner(System.in); /** 用于界面菜单的选择。该方法读取键盘，如果用户键入’1’-’4’中的任意字符，则方法返回。返回值为用户键入字符。 */ public static char readMenuSelection() { char c; for (; ; ) { String str = readKeyBoard(1); c = str.charAt(0); if (c != '1' && c != '2' && c != '3' && c != '4') { System.out.print("选择错误，请重新输入："); } else break; } return c; } /** 用于收入和支出金额的输入。该方法从键盘读取一个不超过4位长度的整数，并将其作为方法的返回值。 */ public static int readNumber() { int n; for (; ; ) { String str = readKeyBoard(4); try { n = Integer.parseInt(str); break; } catch (NumberFormatException e) { System.out.print("数字输入错误，请重新输入："); } } return n; } /** 用于收入和支出说明的输入。该方法从键盘读取一个不超过8位长度的字符串，并将其作为方法的返回值。 */ public static String readString() { String str = readKeyBoard(8); return str; } /** 用于确认选择的输入。该方法从键盘读取‘Y’或’N’，并将其作为方法的返回值。 */ public static char readConfirmSelection() { char c; for (; ; ) { String str = readKeyBoard(1).toUpperCase(); c = str.charAt(0); if (c == 'Y' || c == 'N') { break; } else { System.out.print("选择错误，请重新输入："); } } return c; } private static String readKeyBoard(int limit) { String line = ""; while (scanner.hasNext()) { line = scanner.nextLine(); if (line.length() < 1 || line.length() > limit) { System.out.print("输入长度（不大于" + limit + "）错误，请重新输入："); continue; } break; } return line; } }

2021年11月29日
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2021-11-28

java练习2 看不懂的链表public class NodeTest { public static void main(String[] args) { Node node1 = new Node(1, "李白1", "刺客1"); Node node2 = new Node(2, "李白2", "刺客2"); Node node3 = new Node(3, "李白3", "刺客3"); Node node4 = new Node(4, "李白4", "刺客4"); Node node5 = new Node(5, "李白5", "刺客5"); Node node6 = new Node(5, "李白", "刺客5"); SingleLinkedList singleLinkedList = new SingleLinkedList(); singleLinkedList.add(node1); singleLinkedList.add(node2); singleLinkedList.add(node4); singleLinkedList.add(node5); singleLinkedList.add2(node3); singleLinkedList.delete(3); singleLinkedList.delete(6); singleLinkedList.change(node6); singleLinkedList.change(1, "李白6", "刺客6"); singleLinkedList.show(); } } class SingleLinkedList{ private Node head=new Node(0, "", ""); public void add(Node node){ Node temp = head; while (true){ if (temp.next == null){ break; } temp = temp.next; } temp.next = node; } public void add2(Node node){ Node temp = head; boolean flag = false; while (true){ if (temp.next == null){ break; } if (temp.next.no > node.no){ break; }else if (temp.next.no == node.no){ flag = true; break; } temp = temp.next; } if (flag){ System.out.println("编号已经存在，不能添加"); }else { node.next = temp.next; temp.next = node; } } public void delete(int no){ Node temp = head; boolean flag = false; while (true){ if (temp.next == null){ break; } if (temp.next.no == no){ flag = true; break; } temp = temp.next; } if (flag){ temp.next = temp.next.next; }else { System.out.println("不存在"); } } public void change(int no, String name, String type){ if(head.next == null){ System.out.println("链表为空"); return; } Node temp = head.next; boolean flag = false; while (true){ if(temp == null){ System.out.println("没有找到数据"); break; } if (temp.no == no){ flag = true; break; } } if (flag){ temp.name = name; temp.type = type; } } public void change(Node node){ Node temp = head; //boolean flag = false; delete(node.no); add2(node); } public void show(){ if (head.next == null){ System.out.println("该链表为空"); return; } Node temp = head.next; while (true){ if (temp == null){ break; } System.out.println(temp); temp = temp.next; } } } class Node{ public int no; public String name; public String type; public Node next; public Node(int no, String name, String type){ this.no = no; this.name = name; this.type = type; } @Override public String toString() { return "Node{" + "no=" + no + ", name='" + name + '\'' + ", type='" + type + '\'' + '}'; } }

2021年11月28日
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2021-11-14

java练习1 一.例题1.打印三角形效果：代码：public class triangle { public static void main(String[] args){ //public private for (int i = 0; i < 5; i++){ for (int j = 0; j <= i; j++){ System.out.print("*"); } System.out.println(); } } }结果：* ** *** **** *****2.打印三角形pro效果：代码1：在第一个的基础上另外循环一次，补出来下面的部分public class trianglepro { public static void main(String[] args){ for (int i = 0; i < 5; i++){ for (int j = 0; j <= i; j++){ System.out.print("*"); } System.out.println(); } for (int i = 4; i > 0; i--){ for (int j = 0; j < i; j++){ System.out.print("*"); } System.out.println(); } } }代码2：使用绝对值（有点难）public class trianglepro { public static void main(String[] args){ for (int i = 0; i < 5*2-1; i++){ //Math.abs（）绝对值 for (int j = 0; j < 5 - Math.abs(4-i); j++){ System.out.print("*"); } System.out.println(); } } }结果：* ** *** **** ***** **** *** ** *3.打印三角形promax效果：代码：public class trianglepromax { public static void main(String[] args){ for (int i = 0; i < 5*2-1; i++) { for (int j = 0; j < Math.abs(4-i); j++) { System.out.print(" "); } for (int j = 0; j < (5-Math.abs(4-i))*2 - 1; j++) { System.out.print(i%2); } System.out.println(); } } }结果： 0 111 00000 1111111 000000000 1111111 00000 111 0 4.打印三角形promax远峰蓝（很离谱）效果代码：import java.awt.*; import javax.swing.JLabel ; import javax.swing.JFrame ; public class TriangleProMaxSierraBlue { public static void main(String args[]){ JFrame frame = new JFrame("TriangleProMaxSierraBlue") ; frame.setLayout(new FlowLayout()); String str=""; for(int i=0;i<5*2-1;i++){ for(int j=0;j<Math.abs(4-i);j++){ str+=" "; } for(int j=0;j<(5-Math.abs(4-i))*2-1;j++){ str+=i%2; } //这里补齐了后面的空格 for(int j=0;j<Math.abs(4-i);j++){ str+=" "; } JLabel lab = new JLabel(str,JLabel.CENTER) ; // 实例化标签对象 Font font = new Font("宋体", Font.PLAIN, 25); lab.setFont(font); lab.setForeground(new Color(173,198,220));; frame.add(lab) ; // 将组件件入到面板之中 str=""; } Dimension dim = new Dimension() ; dim.setSize(200,350) ; //窗体的大小 frame.setSize(dim) ; //设置窗体大小 Point point = new Point(500,100) ; // 设置坐标 frame.setLocation(point) ; //设置窗体坐标 frame.setVisible(true) ; //设置窗体可见 } }结果：就是上面的图片，不再重复5.打印三角形（输入版）代码：import java.util.Scanner; public class triangle_input { public static void main(String[] args){ //这里是输入 Scanner input = new Scanner(System.in); int num = input.nextInt(); for (int i = 0; i < num; i++){ for (int j = 0; j < i + 1; j++){ System.out.print("*"); } System.out.println(); } } } 结果：4 * ** *** ****2.面试题（看不懂，一脸懵逼）题目：/* 有一个方阵，方阵中有男生0和女生1。一个女生上、下、左、右的女生与她本人同属于一朵"花"。方阵中有多少"花"？ */ public class flowerNumber { public static void main(String[] args){ int[][] studentCube={{0,0,1,1,1}, {1,0,1,0,0}, {1,1,1,0,1}, {0,0,0,0,0}, {1,1,0,1,1}}; System.out.print("Number of flowers is "+solution(studentCube)); } public static int solution(int[][] studentCube){ int flowerNum=0; //输入内容 return flowerNum; } }代码：（用到了迭代，看不懂啊）这个是彬酱的有关迭代的递归和迭代public class flowerNumber { public static void main(String[] args){ int[][] studentCube={{0,0,1,1,1}, {1,0,1,0,0}, {1,1,1,0,1}, {0,0,0,0,0}, {1,1,0,1,1}}; System.out.print("Number of flowers is "+solution(studentCube)); } public static int solution(int[][] studentCube){ int flowerNum=0; for(int i=0;i<5;i++){ for(int j=0;j<5;j++){ if(studentCube[i][j]==0) continue; flowerNum++; tagFemaleToMale(studentCube,i,j); } } return flowerNum; } public static void tagFemaleToMale(int[][] studentCube,int i,int j){ studentCube[i][j]=0; if(i<4){ if(studentCube[i+1][j]==1) tagFemaleToMale(studentCube,i+1,j); } if(j<4){ if(studentCube[i][j+1]==1) tagFemaleToMale(studentCube,i,j+1); } if(i>0){ if(studentCube[i-1][j]==1) tagFemaleToMale(studentCube,i-1,j); } if(j>0){ if(studentCube[i][j-1]==1) tagFemaleToMale(studentCube,i,j-1); } } }结果：Number of flowers is 4三.总结要加快进度看视频啊，要来不及了很多绝对值那里需要再看看递归和迭代搞不懂，有机会就学

2021年11月14日
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