import - How to compile dependent .java files located in different packages -

i have folder named pack, inside there 2 folders p1 , p2.

inside folder p1 write following code in file named sum.java

package pack.p1; public class sum{ public static void display_sum(int a,int b){ system.out.println("sum = "+(a+b)); } } 

then inside folder p2 write following code in file named wap8.java

package pack.p2; import pack.p1.sum; import java.util.scanner; class wap8{ public static void main(string args[]){ scanner s=new scanner(system.in); system.out.println("enter 2 no.s = "); int a=s.nextint(); int b=s.nextint(); sum.display_sum(a,b);  } } 

here flow of execution in cmd prompt. first create class file of sum.java executing

h:\java\wap 4\pack\p1>javac sum.java

then set classpath sum as

h:\java\wap 4\pack\p1>set classpath=%classpath%;h:\java\wap 4\pack;

then in cmd line come folder p2 , execute following, shows package pack.p1 doesnt exist. why so??

h:\java\wap 4\pack\p2>javac wap8.java

wap8.java:2: error: package pack.p1 not exist

import pack.p1.sum;

          ^ 

wap8.java:10: error: cannot find symbol

sum.display_sum(a,b);

^

symbol: variable sum

location: class wap8

2 errors

i tried setting classpath vairable in environment variables variable name classpath , variable value h:\java\wap 4\pack;. still not working when execute javac wap8.java , showing same error above

you overly complicating things no reason. use following steps , should good.

1. navigate h:\java\wap 4\pack\p1 directory.
2. javac sum.java
3. navigate h:\java\wap 4\ directory.
4. javac pack\p2\wap8.java

that's it. no need setting classpath explicitly. reason why have compile wap8 wap 4 folder because package statement in class binds qualified name. sum1 has fqn pack.p1.sum , wap8 has fqn pack.p2.wap8. therefore, javac won't able see pack.p1.sum when in pack\p2 folder.

you can run code h:\java\wap 4 directory using java pack.p2.wap8