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I know that this Question is repeated but I can't find the answer in the Internet.
I want to call a method from another class.
I have Class1 and Class2.
In Class 2 I have this method:
public void UpdateEmployee(){ //some code } I want to call the above method from Class1.
Thanks for any answer.
----EDIT----
final Button btnUpdate = (Button)findViewById(R.id.btnUpd); btnUpdate.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Employee updEmple = new Employee(); updEmple.UpdateEmployee(); } }); ----LogCat---
05-28 16:30:44.030: E/AndroidRuntime(25198): FATAL EXCEPTION: main 05-28 16:30:44.030: E/AndroidRuntime(25198): java.lang.NullPointerException: println needs a message 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.util.Log.println_native(Native Method) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.util.Log.v(Log.java:116) 05-28 16:30:44.030: E/AndroidRuntime(25198): at and.net.Employee.UpdateEmployee(Employee.java:77) 05-28 16:30:44.030: E/AndroidRuntime(25198): at and.net.AndActivity$2.onClick(AndActivity.java:51) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.view.View.performClick(View.java:2485) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.view.View$PerformClick.run(View.java:9080) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.os.Handler.handleCallback(Handler.java:587) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.os.Handler.dispatchMessage(Handler.java:92) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.os.Looper.loop(Looper.java:123) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-28 16:30:44.030: E/AndroidRuntime(25198): at java.lang.reflect.Method.invokeNative(Native Method) 05-28 16:30:44.030: E/AndroidRuntime(25198): at java.lang.reflect.Method.invoke(Method.java:507) 05-28 16:30:44.030: E/AndroidRuntime(25198): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 05-28 16:30:44.030: E/AndroidRuntime(25198): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-28 16:30:44.030: E/AndroidRuntime(25198): at dalvik.system.NativeStart.main(Native Method) 
995
You should use the following code : Class2 cls2 = new Class2(); cls2. UpdateEmployee(); In case you don't want to create a new instance to call the method, you can decalre the method as static and then you can just call Class2.
In Java, a method can be invoked from another class based on its access modifier. For example, a method created with a public modifier can be called from inside as well as outside of a class/package. The protected method can be invoked from another class using inheritance.
Example: public class CallingMethodsInSameClass { // Method definition performing a Call to another Method public static void main(String[] args) { Method1(); // Method being called. Method2(); // Method being called. } // Method definition to call in another Method public static void Method1() { System. out.
To class a method of another class, we need to have the object of that class. Here, we have a class Student that has a method getName() . We access this method from the second class SimpleTesting by using the object of the Student class.
You should use the following code :
Class2 cls2 = new Class2(); cls2.UpdateEmployee(); In case you don't want to create a new instance to call the method, you can decalre the method as static and then you can just call Class2.UpdateEmployee().
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In Class1:
Class2 inst = new Class2(); inst.UpdateEmployee(); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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