使用if语句和随机数生成器切换活动

Question

我正在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语句并停在那里。我不认为我的随机数发生器正在产生任何随机数。提前致谢。

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)产生0，你在通过什么之间的随机数，这是0（不含）。要得到1到5之间的随机数，你应该使用类似guess.nextInt(5) + 1的东西。我认为在这种情况下结果总是5，但我会使用调试器或打印出Logcat的值来检查。

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); 
     } 
    } 
}