java - How to know a variable type

MainActivity.java

 package com.cfsuman.me.javaexamples;  import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Window; import android.widget.RelativeLayout; import android.widget.TextView;   public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         requestWindowFeature(Window.FEATURE_ACTION_BAR);         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Set background color for action kafe         getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.RED));          // Get widget reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         TextView tv = (TextView) findViewById(R.id.tv);          // Empty the TextView         tv.setText("");          // Initialize a new String variable         String StringVariable = "Innee";         tv.setText(StringVariable.getClass().getSimpleName() + " : " + StringVariable);          // Initialize a new Boolean variable         Boolean BooleanVariable = true;         tv.setText(tv.getText() + "\n"                 + BooleanVariable.getClass().getSimpleName() + " : " + BooleanVariable);          // Initialize a new Integer variable         Integer IntegerVariable = 456;         tv.setText(tv.getText() + "\n"                 + IntegerVariable.getClass().getSimpleName() + " : " + IntegerVariable);          // Initialize a new Double variable         Double DoubleVariable = 125.99;         tv.setText(tv.getText() + "\n"                 + DoubleVariable.getClass().getSimpleName() + " : " + DoubleVariable);          // Initialize a new Float type variable         Float FloatVariable = 5.29f;         tv.setText(tv.getText() + "\n"                 + FloatVariable.getClass().getSimpleName() + " : " + FloatVariable);          // Initialize a new Byte type variable         Byte ByteVariable = 22;         tv.setText(tv.getText() + "\n"                 + ByteVariable.getClass().getSimpleName() + " : " + ByteVariable);     } } 

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