我正在看关于循环的在线java教程.这创建了一个将运行一分钟的循环.在每个循环中,完成一个数字的平方根,然后该数字增加1.从理论上讲,这将用于测量器件的速度,因为根据器件的电位可以得到不同数量的环路重复.
问题是我不能在Android中使这项工作.这是我的代码:
package com.example.app; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.widget.TextView; import java.util.Calendar; public class MainActivity extends ActionBarActivity { TextView tv1, tv2; int index = 0; int s, second, minute; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main); tv1 = (TextView) findViewById(R.id.tv1); tv2 = (TextView) findViewById(R.id.tv2); //CURRENT TIME Calendar c = Calendar.getInstance(); minute = c.get(Calendar.MINUTE); second = c.get(Calendar.SECOND); //TIME AFTER 5 SECONDS s = second + 5; tv1.setText("Processing... Initial Time: " + minute + " minutes " + second + "seconds" ); while (true){ double x = Math.sqrt(index); index++ ; // each loop will check the until 5 seconds elapsed c = Calendar.getInstance(); if (c.get(Calendar.SECOND) == s);{ tv2.setText("\nDone! Final Time: " + c.get(Calendar.MINUTE) + " minutes " + c.get(Calendar.SECOND) + "seconds\n" + index + " Loops in 5 seconds\n" + "checking boolean... " +c.get(Calendar.SECOND) + " = " + s); break; } } } }
这就是结果: