Create encapsulation.java

encapsulation.java

@@ -0,0 +1,47 @@
+public class encapsulation {
+    public static void main(String[] args) {
+        int a=157;
+        C2 e=new C2();
+        e.setC(a);
+        System.out.println(e.getC().f);
+        System.out.println(e.d.f);
+        e.setCasD();
+        System.out.println(e.getC().f);
+        System.out.println(e.d.f);
+        e.setCasB();//c = b
+        e.d.f=79;// resetting value of d.f
+        System.out.println(e.getC().f);//45
+        System.out.println(e.d.f);//79
+    }
+}
+
+class C2{
+    private C3 c=new C3();
+    private final C3 b=new C3();//it is final instance of c3 and cannot be changed
+    C3 d=new C3();
+
+    public C3 getC(){
+        return c;
+    }
+    public void setC(int a){
+        if (a<100) {
+            c.f = a;
+        }else{
+            c.f=99;
+        }
+    }
+    public void setDasC(){
+        d=c;
+    }
+    public void setCasD(){
+        c=d;
+    }
+    public void setCasB(){
+        c=b;//The final field C2.b cannot be assigned
+    }
+
+}
+
+class C3{
+    int f=45;
+}