Main.java:6: error: size has private access in ArrayList
ArrayList a1=new ArrayList();System.out.println("size of a1="+a1.size);
^
Main.java:9: error: cannot find symbol
a1.add(1,a2);
^
symbol: variable a2
location: class ArrayListDemo
Main.java:10: error: size has private access in ArrayList
System.out.println("size of a1="+a1.size);
^
Main.java:13: error: size has private access in ArrayList
System.out.println("size of a1="+a1.size);
^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors