Java by API/java.math/BigDecimal — различия между версиями

Материал из Java эксперт
Перейти к: навигация, поиск
м (1 версия)
 
(нет различий)

Текущая версия на 14:10, 31 мая 2010

BigDecimal: abs()

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: add(BigDecimal augend)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: divide(BigDecimal divisor)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: divide(BigDecimal divisor, int roundingMode)

  
import java.math.BigDecimal;
public class Main {
  public static void main(String[] argv) throws Exception {
    BigDecimal bd1 = new BigDecimal("123456789.0123456890");
    // Create via a long
    BigDecimal bd2 = BigDecimal.valueOf(123L);
    bd1 = bd1.divide(bd2, BigDecimal.ROUND_UP);
  }
}





BigDecimal: doubleValue()

  
import java.math.BigDecimal;
public class Main {
  public static void main(String args[]) {
    double r = 3.1234567;
    int decimalPlace = 2;
    BigDecimal bd = new BigDecimal(r);
    bd = bd.setScale(decimalPlace, BigDecimal.ROUND_UP);
    r = bd.doubleValue();
    System.out.println(r);
  }
}





BigDecimal: equals(Object x)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: max(BigDecimal val)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: min(BigDecimal val)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: multiply(BigDecimal multiplicand)

  
import java.math.BigDecimal;
import javax.swing.JFrame;
public class MainClass extends JFrame {
  public static void main(String[] a) {
    BigDecimal bn1 = new BigDecimal("98765423462576235623562346234623462.35632456234567890");
    BigDecimal bn2 = new BigDecimal("9898234523235624664376437634674373436547.34586558");
    BigDecimal bn3 = bn1.multiply(bn2);
    System.out.println(bn3);
  }
}





BigDecimal: negate()

  
import java.math.BigDecimal;
public class Main {
  public static void main(String[] argv) throws Exception {
    BigDecimal bd1 = new BigDecimal("123456789.0123456890");
    bd1 = bd1.negate();
  }
}





BigDecimal: pow(int n)

  
import java.math.BigDecimal;
public class Main {
  public static void main(String[] args) {
    BigDecimal decimalA = new BigDecimal("123456789012345");
    BigDecimal decimalB = new BigDecimal("10");
    decimalA = decimalA.add(decimalB);
    System.out.println("decimalA = " + decimalA);
    decimalA = decimalA.multiply(decimalB);
    System.out.println("decimalA = " + decimalA);
    decimalA = decimalA.subtract(decimalB);
    System.out.println("decimalA = " + decimalA);
    decimalA = decimalA.divide(decimalB);
    System.out.println("decimalA = " + decimalA);
    decimalA = decimalA.pow(2);
    System.out.println("decimalA = " + decimalA);
    decimalA = decimalA.negate();
    System.out.println("decimalA = " + decimalA);
  }
}





BigDecimal: remainder(BigDecimal divisor)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal.ROUND_DOWN

  
import java.math.BigDecimal;
public class Main {
  public static void main(String[] argv) throws Exception {
    int decimalPlaces = 2;
    BigDecimal bd = new BigDecimal("123456789.0123456890");
     
    bd = bd.setScale(decimalPlaces, BigDecimal.ROUND_DOWN);
    String string = bd.toString();
  }
}





BigDecimal.ROUND_HALF_DOWN

 
import java.math.BigDecimal;
public class Main {
  public static void main(String args[]) {
    BigDecimal rate = new BigDecimal(".03251234");
    BigDecimal months = new BigDecimal("12");
    BigDecimal monthlyRate = rate
        .divide(months, BigDecimal.ROUND_HALF_DOWN);
    System.out.println("Annual rate : " + rate);
    System.out.println("Monthly rate: " + monthlyRate);
    BigDecimal balance = new BigDecimal("10000.0000");
    for (int i = 0; i < 12; i++) {
      BigDecimal interest = balance.multiply(monthlyRate);
      balance = balance.add(interest);
      System.out.println("Balance: " + balance);
    }
  }
}





BigDecimal.ROUND_HALF_UP

  
import java.math.BigDecimal;
public class Main {
  public static void main(String args[]) {
    BigDecimal bd = new BigDecimal(3.14159);
    bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
    System.out.println(bd);
  }
}
//3.14





BigDecimal.ROUND_UP

  
import java.math.BigDecimal;
public class Main {
  public static void main(String[] argv) throws Exception {
    BigDecimal bd1 = new BigDecimal("123456789.0123456890");
    // Create via a long
    BigDecimal bd2 = BigDecimal.valueOf(123L);
    bd1 = bd1.divide(bd2, BigDecimal.ROUND_UP);
  }
}





BigDecimal: setScale(int newScale, int roundingMode)

  
import java.math.BigDecimal;
public class Main {
  public static void main(String args[]) {
    BigDecimal bd = new BigDecimal(3.14159);
    bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
    System.out.println(bd);
  }
}
//3.14





BigDecimal: subtract(BigDecimal subtrahend)

  
/*
3419229223372036854775809.23343
3419229223372036854775805.23343
1709614611686018427387903.616715
false
3419229223372036854775807.23343
3419229223372036854775807.23343
2.0
1.23343
*/
import java.math.BigDecimal;
public class MainClass {
  public static void main(String argv[]) {
    BigDecimal first = new BigDecimal("3419229223372036854775807.23343");
    BigDecimal second = new BigDecimal("2.0");
    System.out.println(first.add(second));
    System.out.println(first.subtract(second));
    System.out.println(first.divide(second));
    System.out.println(first.equals(second));
    System.out.println(first.abs());
    System.out.println(first.max(second));
    System.out.println(first.min(second));
    System.out.println(first.remainder(second));
  }
}





BigDecimal: valueOf(long val)

  

import java.math.BigDecimal;
public class Main {
  public static void main(String[] argv) throws Exception {
    // Create via a string
    BigDecimal bd1 = new BigDecimal("123456789.0123456890");
    // Create via a long
    BigDecimal bd2 = BigDecimal.valueOf(123L);
    bd1 = bd1.add(bd2);
  }
}





new BigDecimal(String val)

  
import java.math.BigDecimal;
import javax.swing.JFrame;
public class MainClass extends JFrame {
  public static void main(String[] a) {
    BigDecimal bn1 = new BigDecimal("98765423462576235623562346234623462.35632456234567890");
    BigDecimal bn2 = new BigDecimal("9898234523235624664376437634674373436547.34586558");
    BigDecimal bn3 = bn1.multiply(bn2);
    System.out.println(bn3);
  }
}


Источник — «http://jexp.ru/index.php?title=Java_by_API/java.math/BigDecimal&oldid=65»