2017-4-22:实用类总结
来源:互联网 发布:数据挖掘 面试 编辑:程序博客网 时间:2024/06/06 06:45
实用类
class Date
initail
Date date = new Date();
Date date = new Date(time);
- Date date = calendar.getTime();
SimpleDateFormat
-> import java.text.SimpleDateFormat
String pattern = “YYYY - MM - dd HH : mm : ss EE”;
SimpleDateFormat format = new SimpleDateFormat(pattern);
- String date = format.format(new Date(System.currentTimeMillis());
abstract class Calendar
initail
- Calendar cal = Calendar.getInstance();
- Calendar cal = cal.setTime(new Date());
methods
public final void set(int year, int month, int date);
public final void set(int year, int month, int date, int hour, int minute);
public final void set(int year, int month, int date, int hour, int minute, int second);
public final void setTime(new Date());
public int get(int field);
public long getTimeInMillis();
public int getActualMaximum();
(set(int year, int month + 1, 0) 也能获得一样的效果);
class Math
methods
public static long abs(double a);
public static double max(double a, double b);
public static double min(double a, double b);
public static double min(double a, double b);
public static double random(); //range from 0 to 1;
public static double pow(double a, double b);
public static double sqrt(double a);
public static double log(double a);
public static double sin(double a);
public static double asin(double a);
format
-> import java.text.NumberFormat
public static final NumberFormat getInstance();
public final String format(double number);
public void setMaximumFractionDigits(int newValue);
public void setMinimumFractionDigits(int newValue);
public void setMaximumIntegerDigits(int newValue);
public void setMinimumIntegerDigits(int newValue);
class BigInteger
initail
- public BigInteger(String val);
methods
public BigInteger add(BigInteger val);
public BigInteger subtract(BigInteger val);
public BigInteger multiply(BigInteger val);
public BigInteger divide(BigInteger val);
public BigInteger remainder(BigInteger val);
public int compareTo(BigInteger val);
public BinInteger abs();
public BigInteger pow(int exponent);
public String toString();
public String toString(int p);
- 2017-4-22:实用类总结
- java实用类总结
- 实用javaScript技术总结(2):屏蔽类
- 实用javaScript技术总结(1)屏蔽类
- 实用javaScript技术总结(1):屏蔽类
- 实用javaScript技术总结(1):屏蔽类
- 实用javaScript技术总结(1):屏蔽类
- Unity Mathf 类总结。。很实用哦。。。。
- 实用javaScript技术总结:屏蔽类
- PHPExcel类实用的方法总结
- Linux实用操作总结
- 实用javaScript技术总结
- 实用javaScript技术总结
- ORACLE实用总结
- JavaEE实用函数总结
- SQL实用知识总结
- MyEclipse实用快捷键总结
- JavaEE实用函数总结
- java设计模式——适配器模式二
- JQuery选中select组件被选中的值
- 从linux进程机制到TopwiseProp的分析
- C++ windows API获取驱动器根路径和属性(-)
- 获取CheckBoxList当前选择项
- 2017-4-22:实用类总结
- EvenBus 避免跳进大坑
- java基础总结15-面向对象11(抽象类)
- 在线黑科技小工具
- MySQL实验(三) 过程式数据库对象的使用
- java.util.Date和java.sql.Date的区别和相互转化
- 百练_3671字符串排序
- [勇者闯LeetCode] 110. Balanced Binary Tree
- NYPJ 蛇形填数