Use of javap

javap command is stand for java parsing .you can see public and protected method for a particular library class.
Take an example To see all the protected and public method of ArrayList, we have to execute below command
->javap java.util.ArrayList

output:

Compiled from "ArrayList.java"
public class java.util.ArrayList extends java.util.AbstractList implements java.util.List,java.util.RandomAccess,java.lang.Cloneable,java.io.Serializable{
    public java.util.ArrayList(int);
    public java.util.ArrayList();
    public java.util.ArrayList(java.util.Collection);
    public void trimToSize();
    public void ensureCapacity(int);
    public int size();
    public boolean isEmpty();
    public boolean contains(java.lang.Object);
    public int indexOf(java.lang.Object);
    public int lastIndexOf(java.lang.Object);
    public java.lang.Object clone();
    public java.lang.Object[] toArray();
    public java.lang.Object[] toArray(java.lang.Object[]);
    public java.lang.Object get(int);
    public java.lang.Object set(int, java.lang.Object);
    public boolean add(java.lang.Object);
    public void add(int, java.lang.Object);
    public java.lang.Object remove(int);
    public boolean remove(java.lang.Object);
    public void clear();
    public boolean addAll(java.util.Collection);
    public boolean addAll(int, java.util.Collection);
    protected void removeRange(int, int);
}