//简单的例子哦,试手专用。
class Example {
public static void main(String args[]) { //java入口
int num; //初始化
num = 100; //赋值
System.out.println("This is num: " + num); //打印
num = num * 2; //简单的乘法运算
System.out.print("The value of num * 2 is ");
System.out.println(num);
}
}
class Example {
public static void main(String args[]) { //java入口
int num; //初始化
num = 100; //赋值
System.out.println("This is num: " + num); //打印
num = num * 2; //简单的乘法运算
System.out.print("The value of num * 2 is ");
System.out.println(num);
}
}
class BasicMath{
public static void main(String args[]) {
//用整型变量实现各个基本算术运算符的功能。
System.out.println("Integer Arithmetic");
int ia = 1 + 2;
int ib = ia * 4; //ia是上个运算的结果哦
int ic = ib /5; //ib是上个运算的结果哦
int id = ic - ia;
int ie = -id;
System.out.println("ia = " + ia);
System.out.println("ib = " +ib);
System.out.println("ic = " + ic);
System.out.println("id = " + id);
System.out.println("ie = " + ie);
//用浮点型变量实现各个基本算术运算符的功能。
System.out.println("\nFloating Point Arithmetic");
double da = 1 + 2;
double db = da * 4;
double dc = db / 5;
double dd = dc - da;
double de = -dd;
System.out.println("da = " + da);
System.out.println("db = " + db);
System.out.println("dc = " + dc);
System.out.println("dd = " + dd);
System.out.println("de = " + de);
}
}
private void printMemoryInfo(String keyword) {
double free = Runtime.getRuntime().freeMemory();
double total = Runtime.getRuntime().totalMemory();
double useage = ( total - free ) / total * 100;
System.out.println(keyword + " freeMemory:" + + free + " totalMemory:" + total + " useage:"+useage+"%");
}
lz想记录学习可以以博客方式分享一下啊
public void handleMessage(Message msg){
//
}
};h.sendEmptyMessage(0);
h.sendEmptyMessageDelayed(0, 2000);
System.out.print("The value of num * 2 is ");
System.out.println(num);
确实经典!
//获取当前时间.
public static String getTime()
{
String time = System.currentTimeMillis() ;//
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(new Date(time));
}public static void updateTime()
{
Timer t = new Timer();
t.schedule(new TimerTask(){
System.out.println(getTime());
}.run(),1000);
}public static void main(String[]args){
updateTime();
}
}
纯手敲勿喷。
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class TestTimer {
//获取当前时间.
public static String getTime()
{
long time = System.currentTimeMillis() ;//
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(new Date(time));
}
//设置定时器并输出.
public static void updateTime()
{
Timer t = new Timer();
t.schedule(new TimerTask(){
@Override
public void run() {
System.out.println(getTime());
}
},1000,3000);
}
public static void main(String[]args){
updateTime();
}
}