java - How to compare strings

MainActivity.java 
 package com.cfsuman.me.javaexamples;  import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView;   public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get widget reference from XML layout         TextView tv = (TextView) findViewById(R.id.tv);          // Initialize few Strings         String stringRed = "Red";         String stringRed2 = "Red";         String stringRED = "RED";         String stringBlue = "Blue";         String stringNull = null;         String stringNull2 = null;          // Comparing two strings using String.equals() method         tv.setText("String.equals() " + stringRed + " = " + stringRed2 +                 " : " + stringRed.equals(stringRed2));          // Comparing two strings using String.equals() method         tv.setText(tv.getText() + "\nString.equals() " + stringRed + " = " + stringBlue +                 " : " + stringRed.equals(stringBlue));          // Comparing two strings by String.equals() method         tv.setText(tv.getText() + "\nString.equals() " + stringRed + " = "                 + stringRED + " : " + stringRed.equals(stringRED));          // Comparing a string with another null string using String.equals() method         tv.setText(tv.getText() +"\n\nString.equals() "+stringRed +                 " = null : " + stringRed.equals(stringNull));          // This line throw exception when comparing with null string by String.equals() method         //tv.setText(tv.getText() +"\nnull = " + stringRed+" : " + stringNull.equals(stringRed));          // Comparing two strings by ignoring case using String.equals() method         tv.setText(tv.getText() + "\n\nString.equalsIgnoreCase() " + stringRed + " = "                 + stringRED + " : " + stringRed.equalsIgnoreCase(stringRED));           // Compare two strings using == opeartor         boolean result=false;         if(stringRed==stringRed)         {             result = true;         }         tv.setText(tv.getText() +"\n\n(== operator) " +stringRed + " = " + stringRed2 + " : " + result);          // Best way to compare null strings         boolean result2 = false;         if(stringNull == stringNull2)         {             result2=true;         }         tv.setText(tv.getText() + "\n(== operator) null = null" + " : " + result2);          // Compare two strings using String.compareTo() method         boolean result3=false;         if(stringRed.compareTo(stringRed2)==0)         {             // If the two strings are exactly same then String.compareTo() method return zero             result3 = true;         }         tv.setText(tv.getText() +"\n\nString.compareTo() " +stringRed + " = " + stringRed2 + " : " + result3);          // Compare two strings using String.compareTo() method         boolean result4=false;         if(stringRed.compareTo(stringRED)==0)         {             // If strings are equal then return zero             result4 = true;         }         tv.setText(tv.getText() +"\nString.compareTo() " +stringRed + " = " + stringRED + " : " + result4);     } }
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