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compile error... constructor

Mike Eghtebas
Last Modified: 2012-05-12
Why there is an error in line 12?

Thank you.
class A_1{
//    public A_1() {
//    }
//    private int i;
    public A_1(int x) {
//        i=x;

class B_1 extends A_1 { 
    public B_1(){
//        super();

public class Chapter11Reviw_b {
    public static void main(String [] args){
        B_1 b = new B_1();

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