java super和this关键字,super是访问父类,this是访问当前类
class A {
public void eat1() {
System.out.println("爸爸在吃");
}
}
class B extends A {
public void eat2() {
System.out.println("儿子在吃");
}
public void eat(int who) {
if (who == 1) {
this.eat2();
} else {
super.eat1();
}
}
} public class test { public static void main(String[] args) { &...
java限制1个方法同一时间只能被一个线程访问public synchronized void setOrderPay(){ }加上synchronized 修饰符即可...
java stringBuffer(1).stringBuffer和stringBuilder区别stringBuffer是线程安全的,stringBuilder速度更快(2).简单的stringBuffer例子StringBuffer sBuffer = new&nb...
(1).java获取当前日期时间Date date = new Date(); System.out.println(date.toString());输出Fri Jul 02 10:29:55 CST 2021(2).java获取时间戳秒/毫秒D...
(1).java睡眠函数Thread.sleep(时间); //单位为毫秒(2).java睡眠函数例子Date dNow = new Date(); SimpleDateFormat ft = new&nbs...
pattern表示正则表达式,接收正则表达式作为参数例子:String content = "my name is gaojiufeng"; String pattern = "....