Main method not found in class Lab2, please define the main method as: public static void main(String[] args)

Question

I'm trying to run this program but I do not know where to put "main". It seems like the program does not have errors but whenever I run it I get error: Error: Main method not found in class Lab2, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application

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import java.util.Arrays;

public class Lab2 {
    // compute sorting
int [] sortingArrayOne = new int[10000]; // array one
int [] sortingArrayTwo = new int[10000]; // array two


public void randomNumbers() {
    for (int i = 0; i < sortingArrayOne.length; i++) {
    sortingArrayOne[i]=(int)(Integer.MAX_VALUE * Math.random()); // filling array one with random integer   
    sortingArrayTwo[i]=sortingArrayOne[1]; // same random numbers in both arrays



long startTimeArrayOne=System.currentTimeMillis(); // run time of array one
selectionSort(sortingArrayOne); // sorting array one using selection sort
long runTimeArrayOne=System.currentTimeMillis() - startTimeArrayOne; // run time of selection sort

long startTimeArrayTwo = System.currentTimeMillis(); // computing time for array two
Arrays.sort(sortingArrayTwo); // sorting array two 
long runTimeArrayTwo=System.currentTimeMillis() - startTimeArrayTwo; // time to run 

System.out.println("Selection sort time:" + runTimeArrayOne); // printing sort time
System.out.println("Arrays sort time:" + runTimeArrayTwo); // printing array sort time
}}

static void selectionSort(int[] A) {
    // Sort A into increasing order, using selection sort
    for (int lastPlace = A.length-1; lastPlace > 0; lastPlace--) {
    // Find the largest item among A[0], A[1], ...,
    // A[lastPlace], and move it into position lastPlace
    // by swapping it with the number that is currently
    // in position lastPlace.
    int maxLoc = 0; // Location of largest item seen so far.
    for (int j = 1; j <= lastPlace; j++) {
    if (A[j] > A[maxLoc]) {
    // Since A[j] is bigger than the maximum we’ve seen
    // so far, j is the new location of the maximum value
    // we’ve seen so far.
    maxLoc = j;
    }
    }
    int temp = A[maxLoc]; // Swap largest item with A[lastPlace].
    A[max`Loc] = A[lastPlace];
    A[lastPlace] = temp;
    } // end of for loop
    }}

I tried writing main for this pice: `long startTimeArrayOne=System.currentTimeMillis(); // run time of array one selectionSort(sortingArrayOne); // sorting array one using selection sort long runTimeArrayOne=System.currentTimeMillis() - startTimeArrayOne; // run time of selection sort

long startTimeArrayTwo = System.currentTimeMillis(); // computing time for array two Arrays.sort(sortingArrayTwo); // sorting array two long runTimeArrayTwo=System.currentTimeMillis() - startTimeArrayTwo; // time to run

System.out.println("Selection sort time:" + runTimeArrayOne); // printing sort time System.out.println("Arrays sort time:" + runTimeArrayTwo); // printing array sort time }}`

but then I am getting different errors...