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dichgrem
2025-11-15 13:30:17 +08:00
parent c20e8949a5
commit d05d583934
29 changed files with 472 additions and 466 deletions
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6
com/study/demo/Demo.java
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@@ -1,7 +1,7 @@
package com.study.demo;
public class Demo {
public static void main(String [] args) {
System.out.println("HelloWorld!");
}
public static void main(String[] args) {
System.out.println("HelloWorld!");
}
}

18
com/study/demo/test1_1.java
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@@ -1,13 +1,15 @@
package com.study.demo;
import java.util.Scanner;
// I am 212306206
public class test1_type {
public static void main(String[] args) {
Scanner scanner = new Scanner (System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int sum = a + b;
System.out.println(a + " + " + b + " = " + sum);
scanner.close();
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int sum = a + b;
System.out.println(a + " + " + b + " = " + sum);
scanner.close();
}
}

21
com/study/demo/test1_2.java
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@@ -1,16 +1,15 @@
package com.study.demo;
public class test2_for {
public static void main(String[] args) {
int[] numbers = new int[5];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i * 10;
}
System.out.print("数组内容: ");
for (int i = 0; i < numbers.length; i++) {
System.out.print(numbers[i] + " ");
}
public static void main(String[] args) {
int[] numbers = new int[5];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i * 10;
}
}
System.out.print("数组内容: ");
for (int i = 0; i < numbers.length; i++) {
System.out.print(numbers[i] + " ");
}
}
}

25
com/study/demo/test1_3.java
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@@ -1,19 +1,18 @@
package com.study.demo;
public class test3_1_99 {
public static void main(String[] args) {
int[] numbers = new int[99];
public static void main(String[] args) {
int[] numbers = new int[99];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i + 1;
}
int sum = 0;
for (int i = 0; i < numbers.length; i++) {
sum += numbers[i];
}
System.out.println("1+2+...+99 的和 = " + sum);
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i + 1;
}
}
int sum = 0;
for (int i = 0; i < numbers.length; i++) {
sum += numbers[i];
}
System.out.println("1+2+...+99 的和 = " + sum);
}
}

21
com/study/demo/test2_2.java
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@@ -1,14 +1,15 @@
package com.study.demo;
import java.util.Scanner;
public class test5 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int c = scanner.nextInt();
double pi = 3.1415926535;
double area = a * b * c + a * c + (pi * c * c) / 4;
System.out.printf("%.3f\n", area / 10000);
}
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int c = scanner.nextInt();
double pi = 3.1415926535;
double area = a * b * c + a * c + (pi * c * c) / 4;
System.out.printf("%.3f\n", area / 10000);
}
}

14
com/study/demo/test2_3.java
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@@ -3,10 +3,10 @@ package com.study.demo;
import java.util.Scanner;
public class test6 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int result = 1 << n;
System.out.println(result);
}
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int result = 1 << n;
System.out.println(result);
}
}

18
com/study/demo/test2_4.java
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@@ -3,12 +3,12 @@ package com.study.demo;
import java.util.Scanner;
public class test7 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int x = scanner.nextInt();
int y = scanner.nextInt();
int startYear = 2016, startMonth = 8;
int totalMonths = (x - startYear) * 12 + y - startMonth + 1;
System.out.println(totalMonths);
}
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int x = scanner.nextInt();
int y = scanner.nextInt();
int startYear = 2016, startMonth = 8;
int totalMonths = (x - startYear) * 12 + y - startMonth + 1;
System.out.println(totalMonths);
}
}

26
com/study/demo/test2_5.java
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@@ -3,17 +3,17 @@ package com.study.demo;
import java.util.Scanner;
public class test8 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int x = scanner.nextInt();
int k = scanner.nextInt();
int a = x / 1000 % k;
int b = x / 100 % 10 % k;
int c = x / 10 % 10 % k;
int d = x % 10 % k;
System.out.print(a);
System.out.print(b);
System.out.print(c);
System.out.println(d);
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int x = scanner.nextInt();
int k = scanner.nextInt();
int a = x / 1000 % k;
int b = x / 100 % 10 % k;
int c = x / 10 % 10 % k;
int d = x % 10 % k;
System.out.print(a);
System.out.print(b);
System.out.print(c);
System.out.println(d);
}
}

30
com/study/demo/test3_1.java
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@@ -3,20 +3,20 @@ package com.study.demo;
import java.util.Scanner;
public class test3_1 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = scanner.nextInt();
}
for (int i = 0; i < n / 2; i++) {
int temp = arr[i];
arr[i] = arr[n - 1 - i];
arr[n - 1 - i] = temp;
}
for (int i = 0; i < n; i++) {
System.out.print(arr[i] + (i == n - 1 ? "" : " "));
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = scanner.nextInt();
}
for (int i = 0; i < n / 2; i++) {
int temp = arr[i];
arr[i] = arr[n - 1 - i];
arr[n - 1 - i] = temp;
}
for (int i = 0; i < n; i++) {
System.out.print(arr[i] + (i == n - 1 ? "" : " "));
}
}
}