how to find index of element in char array in java code example

Example 1: get index of element in array java

System.out.println(new String(list).indexOf("e"));

Example 2: return matching index array java

public class compareArray{
  public static void main(String[] args){
    
    int[a] = {1,4,5,7};
    int[b] = {6,4,3,7};
    
    
    int[] ab = new int[4];
    
    
    for(int i = 0; i<a.length; i++; )
    {   
      if(a[i] == b[i])
       { 
        int[] ab = new int[4];
        
        Arraylist<Integer> al = new Arraylist<Integer>();
        
        for(int i = 0; i < a.length; i++; )
          
          if(a[i] == b[i])
            
          {  
            al.add(a[i]);  
                            }   
                                  }
      		Object[] c= al.toArray();
      			
      for(Object ob : c)
      {
        System.out.println(obj);
      }