/*final 關鍵字 修飾的變量值 后期不可更改 相當于定義常量常量 ：不可更改*/final int a = 10;//a = 20; 報錯的值不可更改！/*輸入函數* */System.out.println("請輸入數字：");Scanner scanner = new Scanner(System.in);int b = scanner.nextInt(); //需要一個變量來承接 System.out.println(b);String name = scanner.next(); //字符串System.out.println("請輸入年份：");int year = scanner.nextInt();if((year % 4 == 0 && year %100 != 0) || year % 400 ==0) {System.out.println(year + "是閏年");}else {System.out.println(year + "是平年");}System.out.println("請輸入月份：");int moon = scanner.nextInt();if(moon<0 || moon >12) {System.out.println("輸入錯誤！");return;}else if(moon == 1 || moon ==3 || moon == 5 ||moon == 7 || moon ==8|| moon ==10 || moon ==12) {System.out.println(moon + "月有31天");}else if (moon){}//隨機數 Random系統的提供的類，用于獲取一個隨機自然數//（大范圍 - 小范圍 + 1） + 小范圍Random random = new Random(); // int num = random.nextInt(100); 0 ~ 100 // int num = random.nextInt() % 100; -99 ~ 99int num = random.nextInt(40 - 20 + 1) + 20;System.out.println(num);// for(int i = 1;i <= 100; i++) { // if(i % 2 != 0) { // System.out.println(i); // } // }// int sum = 0; // for (int i = 1; i <= 100; i++) { // sum += i; // } // System.out.println(sum);// for(int i = 0;i <= 100; i++) { // if(i % 7 == 0) { // System.out.println(i); // } // }// for (int i = 1;i <= 100;i++) { // if(i % 10 == 7 ) { // System.out.println(i); // } // }// for (int i = 1;i <= 100; i++) { // if(i /10 == 7) { // System.out.println(i); // } // }// for (int i = 1;i<= 100;i++) { // if(i / 7 != 0 && i % 10 != 7) { // System.out.println(i); // } // }int min = 100, max = 0;for(int i = 1 ;i <= 10;i++) { // int num2 = random.nextInt(80 - 30 + 1) + 30;int temp = random.nextInt(51) + 30;if(temp > max) {max = temp;} if(temp < min) {min = temp;}System.out.print(temp + " ");}System.out.println("最大值為：" + max + "；最小值為 ："+min);//練習1for(int i = 1;i < 4;i ++) {for(int j = 1 ;j <= i +1; j++) {System.out.print(j + " ");}System.out.println();} System.out.println("---------------------");//練習2for(int i = 0 ;i < 4; i++) {for(int j =1; j <= 4 - i; j++) {System.out.print(j + " ");}System.out.println();}System.out.println("---------------------");//練習3for(int i = 0;i < 4;i++) {for(int j = 4; j >= i + 1; j--) {System.out.print(j + " ");}System.out.println();}System.out.println("---------------------"); //練習4for(int i = 1;i <= 9; i++) {for(int j = 1; j <= i; j ++) {System.out.print(j + " * " + i + " = " + i * j);}System.out.println();}//while循環//練習1int money = 1000000000;int day = 0;while(money != 0) {money /=2;day ++;}System.out.println("一共花了" + day + "天");}// 數組//eg : 32字節 // int[] a1 = {11, 22, 44, 33, 55, 77, 66}; // a1[0] = 100; // int[] a2 = new int [10]; //0 0 0 0 0 0 0 0 0 0 // // // for(int i = 0;i < a1.length;i++) { // System.out.println(a1[i] + " "); // } // Randon random= new Random();//練習1Random random = new Random(); /* int[] a1 = new int[10];int[] a2 = new int [10]; for(int i = 0 ;i < 10; i++) { a1[i] = random.nextInt(41) + 30;a2[i] = a1[i];System.out.println(a1[i] + " " + a2[i]);} *///練習2 /* int[] arr1 = new int[5];int[] arr2 = new int[5];int[] arr = new int[10];for(int i = 0 ;i < 5; i ++) {arr1[i] = random.nextInt(41) +50;} *///練習3int min = 100, minIndex = 0; //存儲下標int max = 0,maxIndex = 0;int[] array1 = new int [10];for(int i =0; i < 10;i ++) {array1[i] = random.nextInt(41) + 10;if(array1[i] < min) {minIndex = i;min = array1[i] ;} if(array1[i] > max) {maxIndex = i;max = array1[i];}System.out.print(array1[i] + " ");} System.out.println();System.out.println(min + "下標為: " + minIndex);System.out.println(max + "下標為:" + maxIndex);//二維數組 本質有多個一維數組組成//二位數組的length只能獲取行數int[][] m = {{1,2,3,4},{11,22,33,44},{111,222,333,444}};System.out.println(m[1][3]); package yb;import java.util.Scanner;public class beyond {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("請輸入一個年份，謝謝合作！");int wsq= sc.nextInt();if((wsq%4==0 && wsq%100 !=0) || wsq%400 ==0) {System.out.println("好了，你可以上天了。");System.out.println("請輸入一個月份");int yy = sc.nextInt();if(yy==1 || yy==3 || yy==5 || yy==7 || yy==8 || yy==10 || yy==12) {System.out.println("31天");}else if(yy==2) {System.out.println("30天");}else {System.out.println("28天");}}else {System.out.println("就你，還想上天？");System.out.println("請輸入一個月份");int yy = sc.nextInt();if(yy==1 || yy==3 || yy==5 || yy==7 || yy==8 || yy==10 || yy==12) {System.out.println("31天");}else if(yy==2) {System.out.println("30天");}else {System.out.println("29天");}}}package yb;import java.util.Random;public class CircleFor {public static void main(String[] args) {// Random/** Random random = new Random(); int a = random.nextInt(41)+30;*/// System.out.println(a);/** for(int i=1; i<=100;i=i+2) { System.out.println(i); }*//** int sum = 0; for (int i = 1; i <= 100; i++) { sum = sum + i; }* * System.out.println(sum);* * for (int j = 1; j <= 100; j++) { if (j % 7 == 0) System.out.print(j + " "); }* System.out.println();* * for (int j = 1; j <= 100; j++) { if (j % 10 == 7) System.out.print(j + " ");* } System.out.println();* * for (int k = 1; k <= 100; k++) { if (k / 10 == 7) System.out.print(k + " ");* } System.out.println();* * for (int o = 1; o <= 100; o++) { if ((o % 10 != 7) && (o % 10 != 7) && (o /* 10 != 7)) System.out.print(o + " "); } System.out.println();* * int x[] = new int[10]; Random random = new Random();* * for (int y = 0; y < 10; y++) { x[y] = random.nextInt(51) + 30; }* * for (int i = 0; i < 10; i++) { for (int j = 0; j < 10 - i; j++) { if (x[j] >* x[j + 1]) { int t = x[j]; x[j] = x[j + 1]; x[j + 1] = t; } } }* * for(int j =0;j<10;j++) { System.out.println(x[j]); }* * int max = 0, min = 10; for (int i = 1; i <= 100; i++) { int q =* random.nextInt(51) + 30; if (q > max) max = q; if (q < min) min = q; }* System.out.println(max + " " + min);*/for (int i = 1; i <= 4; i++) {for (int j = 1; j <= i; j++) {System.out.print(j + " ");}System.out.println();}System.out.println("-------------------------------------------------------------------------------------------");for (int j = 4; j >= 1; j--) {for (int k = 1; k <= j; k++) {System.out.print(k + " ");}System.out.println();}System.out.println("--------------------------------------------------------------------------------------------");for (int i = 4; i >= 1; i--) {for (int k = 4; k >= i; k--) {System.out.print(k + " ");}System.out.println();}System.out.println("--------------------------------------------------------------------------------------------");for (int i = 1; i <= 9; i++) {for (int j = 1; j <= i; j++) {System.out.print(i + "*" + j + "=" + j * i + " ");}System.out.println();}System.out.println("--------------------------------------------------------------------------------------------");int y = 0;double p = 1000000000;while (p > 0) {p = p / 2;y++;}System.out.println(y);}}}package yb;import java.util.Scanner;public class days {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int a,b,c,i,j;int sum1=0,sum2=0;int [] y = {0,31,28,31,30,31,30,31,31,30,31,30,31};int [] u = {0,31,29,31,30,31,30,31,31,30,31,30,31};System.out.println("請輸入年份：");a = sc.nextInt();if((a%4==0 && a%100 !=0) || a%400 ==0) {System.out.println("請輸入一個月份");b = sc.nextInt();System.out.println("請輸入一天數");c = sc.nextInt();for(i=1;i<=b;i++) {sum1 = sum1 + y[i];}System.out.println(sum1+c);}else {System.out.println("請輸入一個月份");b = sc.nextInt();System.out.println("請輸入一天數");c = sc.nextInt();for(i=1;i<=b;i++) {sum1 = sum1 + u[i];}System.out.println(sum1+c);}}} package java02;import java.util.Scanner;public class section {public static void main(String[] args) {String [][] arr = new String [100][2];Scanner wsq= new Scanner(System.in);System.out.println("請輸入人數：");int pp = wsq.nextInt();for(int i=0;i<pp;i++) {for(int j=0;j<pp;j++) {System.out.println("請輸入賬號:");String zh = wsq.next();arr[i][0] = zh;if(arr[i][0].equals(arr[i+1][0]))j--;else break;}boolean yy = true;while(yy) {System.out.println("請輸入密碼：");String mm = wsq.next();System.out.println("請再次輸入密碼：");String zmm = wsq.next();if(mm.equals(zmm)) {System.out.println("很好！干得漂亮！");arr[pp][1] = zmm;break;}else {System.out.println("兩次密碼不一致！！！");}}}for(int i=0 ; i<pp;i++) {for(int j=0;j<2;j++) {System.out.print(arr[i][j] + " ");}System.out.println();}}}

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