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checker-qual contains annotations (type qualifiers) that a programmer writes to specify Java code for type-checking by the Checker Framework.

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package org.checkerframework.checker.signedness.qual;

import org.checkerframework.framework.qual.DefaultFor;
import org.checkerframework.framework.qual.DefaultQualifierInHierarchy;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TypeKind;
import org.checkerframework.framework.qual.TypeUseLocation;
import org.checkerframework.framework.qual.UpperBoundFor;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * The value is to be interpreted as signed. That is, if the most significant bit in the bitwise
 * representation is set, then the bits should be interpreted as a negative number.
 *
 * @checker_framework.manual #signedness-checker Signedness Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({UnknownSignedness.class})
@DefaultQualifierInHierarchy
@DefaultFor(
        typeKinds = {
            TypeKind.BYTE,
            TypeKind.INT,
            TypeKind.LONG,
            TypeKind.SHORT,
            TypeKind.FLOAT,
            TypeKind.DOUBLE
        },
        types = {
            java.lang.Byte.class,
            java.lang.Integer.class,
            java.lang.Long.class,
            java.lang.Short.class,
            java.lang.Float.class,
            java.lang.Double.class
        },
        value = TypeUseLocation.EXCEPTION_PARAMETER)
@UpperBoundFor(
        typeKinds = {TypeKind.FLOAT, TypeKind.DOUBLE},
        types = {java.lang.Float.class, java.lang.Double.class})
public @interface Signed {}