java indexof、BigDecimal、字符串替换

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