onClickListener按钮比较字符串的问题

Question

早上好，我的按钮有问题。您应该做的是单击它，比较我传递的字符串，如果它与我告诉您启动Intent的字符串相同。

public class SegundoActivity extends AppCompatActivity {
String palabra;
EditText letraI,letraH,letraL,letraD,letraO,letraR;
Button probar;
TextView textView8;
final String palabrafin = "IHLDOR";

private static final String TAG = "";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_segundo);
    letraI = (EditText) findViewById(R.id.letraI);
    letraH = (EditText) findViewById(R.id.letraH);
    letraL = (EditText) findViewById(R.id.letraL);
    letraD = (EditText) findViewById(R.id.letraD);
    letraO = (EditText) findViewById(R.id.letraO);
    letraR = (EditText) findViewById(R.id.letraR);
    textView8 = (TextView) findViewById(R.id.textView8);
    probar = (Button) findViewById(R.id.button);

    String palabra1 = letraI.getText().toString().toUpperCase();
    String palabra2 = letraH.getText().toString().toUpperCase();
    String palabra3 = letraL.getText().toString().toUpperCase();
    String palabra4 = letraD.getText().toString().toUpperCase();
    String palabra5 = letraO.getText().toString().toUpperCase();
    String palabra6 = letraR.getText().toString().toUpperCase();

    palabra = palabra1+palabra2+palabra3+palabra4+palabra5+palabra6;

probar.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        textView8.setText(palabra);
        compare();
        }

});
}

private void compare() {
    if (palabra!=palabrafin) {
        Toast.makeText(SegundoActivity.this,"Contrase invalida " + palabra,Toast.LENGTH_LONG).show();
    }else{
        Intent intent = new Intent(SegundoActivity.this, TercerActivity.class);
        startActivity(intent);
    }

}


}

如果“ palabra”一词与“ palabrafin”一词相等，则表示意图。如果与之不同，则表示“ toast”。