如何在java中获取不带四舍五入的浮点数[重复]

public class TruncateExample {
    public static void main(String[] args) {
        double number = 123.789;
        int truncatedNumber = (int) number;
        System.out.println("Truncated number: " + truncatedNumber); // 输出: 123
    }
}

public class FloorExample {
    public static void main(String[] args) {
        double number = 123.789;
        int truncatedNumber = (int) Math.floor(number);
        System.out.println("Truncated number: " + truncatedNumber); // 输出: 123
    }
}

public class CeilExample {
    public static void main(String[] args) {
        double number = 123.234;
        int truncatedNumber = (int) Math.ceil(number);
        System.out.println("Truncated number: " + truncatedNumber); // 输出: 124
    }
}

import java.math.BigDecimal;
import java.math.RoundingMode;

public class BigDecimalExample {
    public static void main(String[] args) {
        double number = 123.789;
        BigDecimal bd = new BigDecimal(Double.toString(number));
        int truncatedNumber = bd.setScale(0, RoundingMode.DOWN).intValue();
        System.out.println("Truncated number: " + truncatedNumber); // 输出: 123
    }
}