Manipulating your string or data in another class and return results in java

beginners put classes on same package(folder)
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create your first class

public class A {
public static void main(String[] args){
String c="input";
String b=add(c);
}
}


Create you second class

public class B {
public static String add(String d){
String f="output";
String g=d;
d=f+" "+g;
return d
}
}

OUTPUT will be like
input output