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public class A {
static String s;
public static void main(String[] args) {
s = null;
while(s == null);
}
}
public class B {
public static void main(String[] args) {
A.s = "s";
}
}
public class A {
static String s;
public static void main(String[] args) {
while(s == null);
System.out.println("终于出来了");
}
}
public class B {
public static void main(String[] args) {
while(A.s == null) {
A.s = "s";
}
}
}