### Question:
PropertyParser { public String parseString(String name) { String property = getProperties().getProperty(name); if (property == null) { throw new NullPointerException(); } return property; } PropertyParser(Properties properties); Properties getProperties(); void setProperties(Properties properties); String parseString(String name); int parseInt(String name); boolean parseBoolean(String name); float parseFloat(String name); double parseDouble(String name); long parseLong(String name); char parseChar(String name); String toString(String name); int toInt(String name); boolean toBoolean(String name); float toFloat(String name); double toDouble(String name); long toLong(String name); char toChar(String name); String toString(String name, String defaultValue); int toInt(String name, int defaultValue); boolean toBoolean(String name, boolean defaultValue); float toFloat(String name, float defaultValue); double toDouble(String name, double defaultValue); long toLong(String name, long defaultValue); char toChar(String name, char defaultValue);  }### Answer:
@Test public void testParseString() { System.out.println("parseString"); String expResult; String result; Properties props = new Properties(); props.put("value1", "sTr1"); props.put("value2", "str_2"); props.put("empty", ""); props.put("str", "abc"); props.put("boolean", "true"); props.put("float", "24.98"); props.put("int", "12"); props.put("char", "a"); PropertyParser instance = new PropertyParser(props); expResult = "sTr1"; result = instance.parseString("value1"); assertEquals(expResult, result); expResult = "str_2"; result = instance.parseString("value2"); assertEquals(expResult, result); expResult = ""; result = instance.parseString("empty"); assertEquals(expResult, result); expResult = "abc"; result = instance.parseString("str"); assertEquals(expResult, result); expResult = "true"; result = instance.parseString("boolean"); assertEquals(expResult, result); expResult = "24.98"; result = instance.parseString("float"); assertEquals(expResult, result); expResult = "12"; result = instance.parseString("int"); assertEquals(expResult, result); expResult = "a"; result = instance.parseString("char"); assertEquals(expResult, result); try { instance.parseString("nonexistent"); fail("no exception"); } catch (NullPointerException e) { } }