嵌套块和可变范围

public class Main {
/**
 * 时代Java公众号 - nowjava.com 提 供 
**/

    public static void main(String[] arg) {


        boolean x = false;


        if (x = true) System.out.println("x is true");

        else System.out.println("x is false");


        int i = 3;

        int j = 4;


        System.out.println("i=" + i + " j=" + j);


        {

            // Cannot redefine a variable i here

            int ii = 5;

            j++;

            i--;

        }


        System.out.println(