JAVA FOR ACM 备忘录

头

import java.util.*;//for Scanner
import java.math.*;
import java.io.*;//for System.in

方法与技巧

Interger.parseInt(string)
Scanner cin=new Scanner(new BufferedInputStream(System.in))//cin.close()
while(cin.hasNext())
cin.Nextline()
cin.NextBigDecimal()
System.out.println(string)
variable = new type(constration values)
new String().substring(b,e)//前闭后开
double dd = Double.valueOf("123.2"); //string转double
String str_i=Integer.toString(i);//int转string
String.valueOf(i)
Integer.toString(i)
i+""
String str_j = Double.toString(j);//double转string,用于bigdecimal构造
String s1,s2;s1.equals(s2)//对比内容