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Gross investment is the least stable component of aggregate spending and a principal cause of the business cycle. In calculating GDP, investment consists of residential construction; nonresidential construction (of ces, hotels, and other commercial real estate); producers durable equipment; and changes in inventories. While the rate of interest is only one of many variables that in uence investment decisions, it is customary to present investment demand as a negative function of the interest rate, holding constant the other variables which in uence the decision to invest. Thus, a lower interest rate is associated with a higher level of investment, and vice versa. Holding other variables constant, we expect that at a lower rate of interest (1) more households are nancially able to carry a mortgage, and a greater number of housing units will be demanded; (2) businesses are more willing and able to purchase durable equipment and to carry larger inventories; and (3) real estate developers nd that there are a larger number of purchasers for newly constructed commercial real estate.

public class TestPairClass { public static void main(String[] args) { Pair<Month, Integer> christmas = new Pair<Month,Integer>(Month.DEC, 25); System.out.println(christmas); Month month = christmas.getFirst(); int day = christmas.getSecond(); System.out.printf("%d %s%n", day, month); } } enum Month { JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC } class Pair<S, T> { private S first; private T second; public Pair(S first, T second) { this.first = first; this.second = second; } public S getFirst() { return first; } public T getSecond() { return second; } public String toString() { return "(" + first + ", " + second + ")"; } }

The output is:

The generic class is defined at line 13. It has two type parameters: S and T. In the code at lines 14, 15, 17, 22, and 26, these two type parameters are used as place holders for actual types. Note that the <S,T> expression is not used in the constructor definition at line 18. But the <> construct is required when the constructor is invoked, as at line 3.

If you compile a program using nongeneric JCF classes (i.e., without specifying a type arguments for the element type) you re likely to get a compiler message like this:

uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. You can avoid that simply by specifying an element type; even Object itself, like this: List<Object> list = new ArrayList<Object>();

Gross exports are the value of goods and services produced in a home country and sold abroad, i.e., they are the value of foreign spending on U.S.-produced goods and services. Gross imports are the value of U.S.

GENERIC METHODS In addition to generic types, type parameters can also be used to define generic methods, identified by the generic parameter specifier <T> placed in front of the return type. EXAMPLE 4.4 A Generic Method

1 2 3 4 5 6 7 8 9 10 11 12 13

public class TestPrint { public static void main(String[] args) { args = new String[]{"CA", "US", "MX", "HN", "GT"}; print(args); } static <E> void print(E[] a) { for (E ae : a) { System.out.printf("%s ", ae); } System.out.println(); } }

The output is:

The method is identified as generic by the <E> specifier at line 7. This allows the type parameter E to be used in place of an actual type in the method block at line 8.

purchases of goods and services produced in other countries. When commodities are imported, some of the consumption and gross investment spending is for foreign-produced rather than U.S.-produced goods. Imports thereby lower aggregate spending on domestically produced goods. Net exports are the value of gross exports less gross imports, i.e., the net addition to domestic aggregate spending that results from importing and exporting goods and services. Net exports are positive when the home country exports more than it imports, and negative when the home country imports more than it exports. Numerous variables affect a country s imports and exports. A country s imports are related to its level of income, foreign exchange rate, domestic prices relative to prices in foreign countries, import tariffs, and restrictions on imported goods. Exports are in uenced by the same variables, except that the income levels of foreign countries rather than that of the home country affect the amount exported. Because these variables change with time, it is reasonable to expect a country s net export balance to change over time.

GENERIC WILDCARDS The symbol can be used as a wildcard, in place of a generic variable. It stands for unknown type, and is called the wildcard type. EXAMPLE 4.5 A Universal print() Method

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static void print(Collection< > c) { for (Object o : c) { System.out.printf("%s ", o); } System.out.println(); }