方法案例（Java），求和，判断奇偶数，数组求最值

import java.util.Scanner;

//1.计算1--n的和并返回，用方法实现
public class SumTest01 {
    public static void main(String[] args) {
        System.out.println("请输入你需要计算的n:");
        Scanner sc = new Scanner(System.in);
        System.out.println("和为："+Sum(sc.nextInt()));
    }
    public static  int Sum(int n){
        int sum = 0;
        for (int i = 1; i <= n ; i++) {
            sum += i;
        }
        return sum;
    }
}

import java.util.Scanner;

//2.判断整数是奇数还是偶数，使用方法
public class OddAndEvenNumberTest02 {
    public static void main(String[] args) {
        System.out.println("请输入你需要判断的整数:");
        Scanner sc = new Scanner(System.in);
        check(sc.nextInt());
    }
    public static void check(int n){
        if (n % 2 == 0){
            System.out.println(n+"是偶数");
        }else
        {
            System.out.println(n+"是奇数");
        }
    }
}

import java.util.Scanner;
//用方法实现对数组,输入，遍历，求最大值
public class ArrayMaxTest03 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("数组的大小为：");
        int[] arrynumbers = new int[sc.nextInt()];
        input(arrynumbers);
        System.out.println("测试的数组的为：");
        output(arrynumbers);
        System.out.println();
        System.out.println("数组的最大值为："+arrymax(arrynumbers));

    }
    public static void input(int[] arry){
        //输入数组的各个元素
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < arry.length; i++) {
            System.out.println("请输入arry["+i+"]的值：");
            arry[i] = sc.nextInt();
        }
    }
    public static void output(int[] arry){
        //遍历打印输出数组
        for (int i = 0; i < arry.length; i++) {
            System.out.print(arry[i]+"t");
        }
    }
    public static int arrymax(int[] arry){
        //求数组最大值
        int max = arry[0];
        for (int i = 1; i < arry.length; i++) {
            if (arry[i] > max){
                max = arry[i];
            }
        }
        return max;
    }
}