Question

我使用随机数生成器和IF语句在活动之间切换。它遍历第一个if语句并在那里停止。我不认为我的随机数生成器生成任何随机数。提前谢谢。

package app.com.example.android.oraclethedeciscionmaker;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import java.util.Random;

public class HomeScreen extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home_screen);
    }

    public void onClick(View view){

        Random guess = new Random();

        int guesser0 = guess.nextInt(0) + 1;
        int guesser1 = guess.nextInt(0) + 1;
        int guesser2 = guess.nextInt(0) + 1;
        int guesser3 = guess.nextInt(0) + 1;
        int guesser4 = guess.nextInt(0) + 1;

        int result = guesser0 + guesser1 + guesser2 + guesser3 + guesser4;

        // 0 out of 0
        if(result == 0){
            Intent intent = new Intent(HomeScreen.this, ZeroOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        // 1 out of 5
        else if(result == 1){
            Intent intent = new Intent(HomeScreen.this, OneOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        //2 out of 5
        else if(result == 2){
            Intent intent = new Intent(HomeScreen.this, TwoOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        //3 out of 5
        else if(result == 3){
            Intent intent = new Intent(HomeScreen.this, ThreeOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        //4 out of 5
        else if(result == 4){
            Intent intent = new Intent(HomeScreen.this, FourOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity

        }
        //5 out of 5
        else {
            Intent intent = new Intent(HomeScreen.this, FiveOfFive.class);
            startActivity(intent);
        }
    }
}

Answer 1

当您运行guess.nextInt(0)时，会生成0到您传入的内容之间的随机数，即0（不包括）。要获得1到5之间的随机数，您应该使用guess.nextInt(5) + 1之类的内容。我认为在这种情况下结果总是5，但我使用调试器或打印出值Logcat进行检查。

Answer 2

只是一个简单的修改！

package app.com.example.android.oraclethedeciscionmaker;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import java.util.Random;

public class HomeScreen extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home_screen);
    }

    public void onClick(View view){

        Random guess = new Random();

        int result= guess.nextInt(6); // this result can be varies from 0 to 5 

        // 0 out of 5
        if(result == 0){
            Intent intent = new Intent(HomeScreen.this, ZeroOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        // 1 out of 5
        else if(result == 1){
            Intent intent = new Intent(HomeScreen.this, OneOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        //2 out of 5
        else if(result == 2){
            Intent intent = new Intent(HomeScreen.this, TwoOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        //3 out of 5
        else if(result == 3){
            Intent intent = new Intent(HomeScreen.this, ThreeOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity
        }
        //4 out of 5
        else if(result == 4){
            Intent intent = new Intent(HomeScreen.this, FourOfFive.class);
            startActivity(intent);
            // If this statement is true go to this activity

        }
        //5 out of 5
        else {
            Intent intent = new Intent(HomeScreen.this, FiveOfFive.class);
            startActivity(intent);
        }
    }
}

使用if语句和随机数生成器切换活动

2 个答案: