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package string;

import java.math.BigDecimal;

import java.text.SimpleDateFormat;

public class Format {

static int a = 2;

public static void main(String[] args) {

//System.out.println(changeFormat(a));

format();

computeDoubleValue();

}

static int changeFormat(int a) {

if (a < 10) {

a = Integer.parseInt("0" + a);

}

return a;

}

static void format() {

String basic = "姓名：%2$s; 性别：%1$s; 分数：%3$d;";

SimpleDateFormat sdf = new SimpleDateFormat(basic);

String value = String.format(basic, "bingo", "男", 12);

System.out.println("value is " + value);//value is 姓名：男; 性别：bingo; 分数：12;

}

/**

* todo 注意 BigDecimal的参数需要为String,不能直接是double

*/

static void computeDoubleValue() {

double price = 1.52;

int count = 3;

/** 结果是 4.56**/

BigDecimal value1 = BigDecimal.valueOf(price);

double result = value1.multiply(BigDecimal.valueOf(count)).doubleValue();

System.out.println("11111 计算1值为result:"+result);

/** 结果为4.560000000000000053290705182007513940334320068359375**/

BigDecimal value2 = new BigDecimal(price);

String result2 = value2.multiply(new BigDecimal(count)).toString();

System.out.println("计算2值为result:"+result2);

}

}