Question

How to iterate all the static values of a class in Java

Answer 1

import java.util.List;
import java.util.ArrayList;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

public class Program {
    static int a = 1;
    static int b = 2;
    static int c = 3;
    static int d = 4;

    public static void main( String [] args ) {
          for (int i : iterateStaticInt(Program.class)){
              System.out.println(i);
          }
    }

    public static Integer[] iterateStaticInt(Class<Program> c) {
        List<Integer> list  = new ArrayList<Integer>();
        Field[] fields = c.getDeclaredFields();
        
        for (Field field : fields) {
            try {
                if (field.getType().equals(int.class) && Modifier.isStatic(field.getModifiers())) {
                    list.add(field.getInt(null));
                }
            }
            catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        
        return list.toArray(new Integer[list.size()]);
    }
 }
 
 
/*
run:
 
1
2
3
4

*/

 

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