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POClassCastException: EditText to Button Error
 

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    <p>I am working on an android app, which I had fixed after posting it here: <a href="https://stackoverflow.com/questions/15098895/java-android-sdk-unfrotunately-project-name-has-crashed-error">Java - Android SDK - Unfrotunately &lt;project name&gt; has crashed error</a> and fixing the issues. Today I was messing about with the layout, because I didn't like the way it looked after which i attempted to run the program and got an error about casting a <code>EditText</code> to a <code>Button</code>, which I'm pretty sure I'm not doing. What causes the <code>ClassCastException</code>? Thank you in advance for your help. </p> <pre><code> package complex.OliverV; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.RadioButton; import android.widget.EditText; public class ComplexNumbersActivity extends Activity { /** Called when the activity is first created. */ Button Check; RadioButton plus, minus, multiply, div; EditText X1,X2,Y1,Y2; TextView Ans; int sign; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Check = (Button) findViewById(R.id.Check); plus = (RadioButton) findViewById(R.id.plus); minus = (RadioButton) findViewById(R.id.minus); multiply = (RadioButton) findViewById(R.id.multiply); div = (RadioButton) findViewById(R.id.div); Ans = (TextView) findViewById(R.id.Ans); X1=(EditText) findViewById(R.id.X1); X2=(EditText) findViewById(R.id.X2); Y1=(EditText) findViewById(R.id.Y1); Y2=(EditText) findViewById(R.id.Y2); plus.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=1; } }); minus.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=2; } }); multiply.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=3; } }); div.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=4; } }); Check.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub String xs=X1.getText().toString(); String xss=X2.getText().toString(); String ys=Y1.getText().toString(); String yss=Y2.getText().toString(); double x3 = 0, y3 = 0; if(!xs.equals("") &amp;&amp; !xss.equals("") &amp;&amp; !ys.equals("") &amp;&amp; !yss.equals("")&amp;&amp; xs != null &amp;&amp; xss != null &amp;&amp; ys != null &amp;&amp; yss != null) { double x1=Double.parseDouble(xs); double x2=Double.parseDouble(xss); double y1=Double.parseDouble(ys); double y2=Double.parseDouble(yss); switch(sign) { case(1): { x3=x1+x2; y3=y1+y2; } case(2): { x3=x1-x2; y3=y1-y2; } case(3): { x3=(x1*x2 - y1*y2); y3=(x2*y1 + x1*y2); } case(4): { if(x2!=0 &amp;&amp; y2!=0) { x3 = (x1 * x2 + y1 * y2) / (x2 * x2 + y2 * y2); y3 = (x2 * y1 - x1 * y2) / (x2 * x2 + y2 * y2); } else { Ans.setText("Enter valid numbers!"); } } } Ans.setText("x = "+x3+"y = "+y3); } else { Ans.setText("Enter valid numbers!"); } } }); } } </code></pre> <p>This is the list of errors from the Logcat. </p> <pre><code> 02-27 21:04:48.679: E/AndroidRuntime(571): FATAL EXCEPTION: main 02-27 21:04:48.679: E/AndroidRuntime(571): java.lang.RuntimeException: Unable to start activity ComponentInfo{complex.OliverV/complex.OliverV.ComplexNumbersActivity}: java.lang.ClassCastException: android.widget.EditText cannot be cast to android.widget.Button 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.ActivityThread.access$600(ActivityThread.java:123) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.os.Handler.dispatchMessage(Handler.java:99) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.os.Looper.loop(Looper.java:137) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.ActivityThread.main(ActivityThread.java:4424) 02-27 21:04:48.679: E/AndroidRuntime(571): at java.lang.reflect.Method.invokeNative(Native Method) 02-27 21:04:48.679: E/AndroidRuntime(571): at java.lang.reflect.Method.invoke(Method.java:511) 02-27 21:04:48.679: E/AndroidRuntime(571): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 02-27 21:04:48.679: E/AndroidRuntime(571): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 02-27 21:04:48.679: E/AndroidRuntime(571): at dalvik.system.NativeStart.main(Native Method) 02-27 21:04:48.679: E/AndroidRuntime(571): Caused by: java.lang.ClassCastException: android.widget.EditText cannot be cast to android.widget.Button 02-27 21:04:48.679: E/AndroidRuntime(571): at complex.OliverV.ComplexNumbersActivity.onCreate(ComplexNumbersActivity.java:21) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.Activity.performCreate(Activity.java:4465) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 02-27 21:04:48.679: E/AndroidRuntime(571): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 02-27 21:04:48.679: E/AndroidRuntime(571): ... 11 more </code></pre>
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