Example of Collections.replaceAll in Java

package com.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class CollectionsReplaceAll {
     public static void main(String[] args) {
         Bean a1 = new Bean("A");
         Bean a2 = new Bean("B");
         Bean a3 = new Bean("B");
         Bean a4 = new Bean("C");
         List<Bean> list = new ArrayList<Bean>();
         list.add(a1);
         list.add(a2);
         list.add(a3);
         list.add(a4);
         System.out.println("Before replaceAll...");
         for(Bean b: list){
             System.out.print(b.name+" ");
         }
         System.out.println("\n After replaceAll....");
         Collections.replaceAll(list, new Bean("B") , new Bean("X"));
         
         for(Bean b: list){
             System.out.print(b.name+" ");
         }
     }
}
class Bean {
    public String name;
    public Bean(String name) {
        this.name = name;
    }
    @Override
    public boolean equals(Object o) {
        return name.equals(((Bean)o).name);
    }
    @Override
    public int hashCode() {
        int hash = 13;
        hash = (31 * hash) + (null == name ? 0 : name.hashCode());
        return hash;
    }
}

Before replaceAll...
A B B C 
 After replaceAll....
A X X C