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Groovy example source code file (LiteralTypesTest.groovy)

This example Groovy source code file (LiteralTypesTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

bigdecimal, bigdecimal, biginteger, biginteger, double, ff, float, groovytestcase, hex, integer, integer, literaltypestest, long, long

The Groovy LiteralTypesTest.groovy source code

package groovy

/**
 * Test numeric literal types (with and without suffixes)
 * @see org.codehaus.groovy.syntax.parser/ASTBuilder#createIntegralNumber()
 * @see org.codehaus.groovy.syntax.parser/ASTBuilder#createDecimalNumber()
 *
 * @author Brian Larson
 */
class LiteralTypesTest extends GroovyTestCase {

    void testIntegral() {
        def x = 42;
        assert x instanceof Integer;

        x = 42I;
        assert x instanceof Integer;

        x = 42i;
        assert x instanceof Integer;

        x = 42L;
        assert x instanceof Long;

        x = 42G;
        assert x instanceof BigInteger;

        x = 0xFF; //Hex
        assert x instanceof Integer;
        assert x == new Integer("255");

        x = 0xFFL; //Hex
        assert x instanceof Long;
        assert x == new Long("255");

        x = 0xFFG; //Hex
        assert x instanceof BigInteger;
        assert x == new BigInteger("FF",16);

        x = 0x9000000000000000;
        assert x instanceof BigInteger;
        assert x == new BigInteger("9000000000000000",16);

        x = 077; //octal
        assert x instanceof Integer;
        assert x == new Integer("63");

        x = 077l; //octal
        assert x instanceof Long;
        assert x == new Long("63");

        x = 077g; //octal
        assert x instanceof BigInteger;
        assert x == new BigInteger("77",8);

        x = 2147483647;           // max integer value
        assert x instanceof Integer;
        assert x == new Integer("2147483647");

        x = -2147483648;          // min integer constant
        assert x < 0
        assert x == new Integer("-2147483648");
        assert x instanceof Integer, x.class;

        x = -2147483649;          // min integer value - 1
        assert x == new Long("-2147483649");
        assert x instanceof Long;

        x = 2147483648;           // 1 + max integer value
        assert x == new Long("2147483648");
        assert x instanceof Long;

        x = 9223372036854775807;  // max long value
        assert x == new Long("9223372036854775807");
        assert x instanceof Long;

        x = -9223372036854775808; // min long value
        assert x == new Long("-9223372036854775808");
        assert x instanceof Long;

        x = -9223372036854775809; // min long value - 1
        assert x == new BigInteger("-9223372036854775809");
        assert x instanceof BigInteger;

        x = 9223372036854775808;  // 1 + max long value
        assert x == new BigInteger("9223372036854775808");
        assert x instanceof BigInteger;
    }

    void testDecimal() {
        def x = 3.2;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("3.2");

        x = 3.2G;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("3.2");

        x = 3.2g;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("3.2");

        x = -3.2;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("-3.2");

        x = 3.2D;
        assert x instanceof Double;
        assert x == new Double("3.2");

        x = -3.2d;
        assert x instanceof Double;
        assert x == new Double("-3.2");

        x = 3.2F;
        assert x instanceof Float;
        assert x == new Float("3.2");

        x = -3.2f;
        assert x instanceof Float;
        assert x == new Float("-3.2");
    }

    void testExponential() {
        def x = 3.1415926535e42;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("3.1415926535e42");

        x = 3.2e+2;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("3.2e+2");

        x = 3.2e-2;
        assert x instanceof BigDecimal;
        assert x == new BigDecimal("3.2e-2");

        x = 3.2e2d;
        assert x instanceof Double;
        assert x == new Double("3.2e2");

        x = 3.2e2f;
        assert x instanceof Float;
        assert x == new Float("3.2e2");
    }
}

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