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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.common.value.util;

import java.util.ArrayList;
import java.util.List;

import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;

import org.checkerframework.javacutil.TypesUtils;

public class NumberUtils {

    public static List castNumbers(TypeMirror type,
            List numbers) {
        TypeKind typeKind = unBoxPrimative(type);
        switch (typeKind) {
        case BYTE:
            List bytes = new ArrayList<>();
            for (Number l : numbers) {
                bytes.add(l.byteValue());
            }
            return bytes;

        case DOUBLE:
            List doubles = new ArrayList<>();
            for (Number l : numbers) {
                doubles.add(l.doubleValue());
            }
            return doubles;
        case FLOAT:
            List floats = new ArrayList<>();
            for (Number l : numbers) {
                floats.add(l.floatValue());
            }
            return floats;
        case INT:
            List ints = new ArrayList<>();
            for (Number l : numbers) {
                ints.add(l.intValue());
            }
            return ints;
        case LONG:
            List longs = new ArrayList<>();
            for (Number l : numbers) {
                longs.add(l.longValue());
            }
            return longs;
        case SHORT:
            List shorts = new ArrayList<>();
            for (Number l : numbers) {
                shorts.add(l.shortValue());
            }
            return shorts;
        default:
            throw new UnsupportedOperationException(typeKind.toString());
        }
    }

    private static TypeKind unBoxPrimative(TypeMirror type) {
        if (type.getKind() == TypeKind.DECLARED) {
            String stringType = TypesUtils
                    .getQualifiedName((DeclaredType) type).toString();

            switch (stringType) {
            case "java.lang.Byte":
                return TypeKind.BYTE;
            case "java.lang.Boolean":
                return TypeKind.BOOLEAN;
            case "java.lang.Charater":
                return TypeKind.CHAR;
            case "java.lang.Double":
                return TypeKind.DOUBLE;
            case "java.lang.Float":
                return TypeKind.FLOAT;
            case "java.lang.Integer":
                return TypeKind.INT;
            case "java.lang.Long":
                return TypeKind.LONG;
            case "java.lang.Short":
                return TypeKind.SHORT;
            }
        }
        return type.getKind();
    }

}