安卓button设置监听页面跳转没保错但不能运行，求大神赐教

Question

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); EditText username = (EditText) findViewById(R.id.username); String user = username.getText().toString(); EditText password = (EditText) findViewById(R.id.password); String pwd = password.getText().toString(); Button exit = (Button) findViewById(R.id.exit); MyButton listener = new MyButton(); exit.setOnClickListener(listener); if ((user == "hxc" && pwd == "19960208") || (user == "lsj" && pwd == "19961205")) { Intent intent = new Intent(); intent.setClass(MainActivity.this, Main.class); startActivity(intent); } else { Toast tot = Toast.makeText( MainActivity.this, "用户名与密码不匹配", Toast.LENGTH_LONG); tot.show(); } } class MyButton implements View.OnClickListener { @Override public void onClick(View v) { } }}

Answer 1

public class MainActivity extends AppCompatActivity { @Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState); setContentView(R.layout.login);

EditText username = (EditText)findViewById(R.id.username);

String user = username.getText().toString(); EditText password = (EditText) findViewById(R.id.password);

String pwd = password.getText().toString();

Button exit = (Button) findViewById(R.id.exit); MyButton listener = new MyButton(); exit.setOnClickListener(listener);

if ((user == "hxc" && pwd == "19960208") || (user == "lsj" && pwd == "19961205")) {

Intent intent = new Intent(); intent.setClass(MainActivity.this, Main.class); startActivity(intent);

}

else {

Toast tot = Toast.makeText( MainActivity.this, "用户名与密码不匹配", Toast.LENGTH_LONG);

tot.show(); }

}

class MyButton implements View.OnClickListener {

@Override

public void onClick(View v) {

}

}
}