// Test with underscore separators in old format
        System.setProperty("java.version", "1.8.0_301");
        assertEquals(8, JvmUtil.getJavaVersion());
    }

    @Test
    public void test_getJavaVersion_variousFormats() {
        // Test different separator combinations
        System.setProperty("java.version", "11.0.15.1");
        assertEquals(11, JvmUtil.getJavaVersion());