文章目录
JAVA BigDecimal
解决java计算精度问题
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| import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
public class Test {
public static void main(String[] arg) {
BigDecimal num1 = new BigDecimal(2);
BigDecimal num2 = new BigDecimal(3.003);
BigDecimal result;
BigDecimal big = new BigDecimal(100);
System.out.println(big.add(BigDecimal.TEN));
BigDecimal subtract = big.subtract(new BigDecimal(1.13));
System.out.println(subtract.doubleValue());
DecimalFormat df = new DecimalFormat("0.00");
df.setRoundingMode(RoundingMode.DOWN);
System.out.println(df.format(subtract));
System.out.println(df.format(1.555));
System.out.println(df.format(1.596));
System.out.println(df.format(1.531));
System.out.println(df.format(0));
System.out.println(df.format(100));
System.out.println(df.format('b'));
BigDecimal addResult = num1.add(num2);
System.out.println( df.format(addResult) );
System.out.println( addResult.doubleValue() );
System.out.println( num1.divide(num2,5,RoundingMode.HALF_UP) );
result = num1.multiply(num2);
System.out.println( df.format( result ) );
}
}
|
