Public interface MyInterface_1{
public int getVariable_A();
}

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public interface MyInterface_2{
public int getVariable_A();
}

---------------------------------------

public class MyClass_1 implements MyInterface_1{
private int variable_A;

public MyClass_1(){
variable_A = 10;
}

public int getVariable_A(){
return variable_A
}
}

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public class MyClass_2 implements MyInterface_2{
public MyClass_2(){
}

public void getValueFromOtherClass()
MyClass_1 aClass = new MyClass_1();
System.out.println("Valeur lue: " + aClass.getVariable_A);
}
}

;-)