package com.core;

import java.io.IOException;

import java.math.BigDecimal;

import java.text.DecimalFormat;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Test {

    public static void main(String[] args) throws IOException {

        //indexof返回在当前字符串里要查询的字符的下标位置，若不存在返回-1

        String cname = "尼古拉斯凯奇";

        System.out.println(cname.indexOf("斯"));

        String ename = "Nicolas Cage";

        System.out.println(ename.indexOf(" "));

        System.out.println(ename.indexOf("b"));

        //BigDecimal一般用在有金钱交易的平台中，float和double不能保证较高的数值精确度

        BigDecimal b = new BigDecimal("0.41");

        long m = b.multiply(new BigDecimal("300")).longValue(); // 0.41*300

        b = new BigDecimal("0.09");

        long s = b.movePointRight(2).longValue(); // 0.09小数点右移两位

        String result = Long.valueOf(m - s).toString();

        System.out.println(result);

        //DecimalFormat格式化输出

        DecimalFormat df = new DecimalFormat("#0.00");

        DecimalFormat df1 = new DecimalFormat("#.00");

        Double percent = 0.965;

        System.out.println(df.format(percent));

        System.out.println(df1.format(percent));

        //替换字符串里的字符

        String name = "敏感词汇";

        Pattern p = Pattern.compile("敏感");

        Matcher m1 = p.matcher(name);

        if (m1.find()) {

            System.out.println(m1.replaceAll("和谐"));

        }

    }

}

3

7

-1

114

0.96

.96

和谐词汇