declare function in java

1public class Main {
2  public static void main(String args[]) {
3    SayHi();
4    
5    int sum = AddNums(5, 6);
6    System.out.println(sum);
7  }
8  
9  public static void SayHi() { //This method has no return value
10    System.out.println("Hi!");
11  }
12  
13  public static int AddNums(int a, int b) { //This method has a return value
14    return a + b;
15}

1package com.company;
2
3public class Main {
4    static void one(){ // youCanPutWhatEverNameYouLikeInThePlaceOf"One"
5        System.out.println("HELLO");
6    }
7    public static void main(String[] args) {
8        one(); //theTerminalShouldSay"HELLO"
9    }
10}
11

1public class Main
2{
3    static void function(){
4        System.out.println("I am a function!");
5    }
6	public static void main(String[] args) {
7		function();
8	}
9}

1//declare a function like this:
2void function(int parameter1)
3{
4	//function body
5}
6//call the function like this:
7function(1);

1  static void myMethod() {
2    //LINES OF CODE
3  }

1public int addNum(int num1, int num2) {
2  total = num1 + num2;
3  System.out.println("Total: " + total);
4}