Java2.12.1实验1（联合编译）

public class MainClass {
public void printcom(){
System.out.println("Hello, just need to compile. ");
//测试PrintA
PrintA a=new PrintA();
a.printa();
//测试printB
PrintB b=new PrintB();
b.printb();
//测试PrintC
PrintC c=new PrintC();
c.printc();
}

}

public class PrintA {
public void printa(){
System.out.println("I am A");
}

}

public class PrintB {
public void printb(){
System.out.println("I am B");
}

}

public class PrintC {
public void printc(){
System.out.println("I am C");
}

}