参数传递

mthli · mthli · commit b64b962d977b · 2014-03-17T20:16:19.000Z
diff --git a/Part3/ParamTest.java b/Part3/ParamTest.java
@@ -0,0 +1,66 @@
+public class ParamTest {
+    public static void main(String[] args) {
+        System.out.println("Testing tripleValue:");
+        double percent = 10;
+        System.out.println("Before: percent = " + percent);
+        tripleValue(percent);
+        System.out.println("After: percent = " + percent);
+
+        System.out.println("\nTesting tripleSalary:");
+        Employee harry = new Employee("Harrt", 50000);
+        System.out.println("Before: salary = " + harry.getSalary());
+        tripleSalary(harry);
+        System.out.println("After: salary = " + harry.getSalary());
+
+        System.out.println("\nTesting swap:");
+        Employee a = new Employee("Alice", 70000);
+        Employee b = new Employee("Bob", 60000);
+        System.out.println("Before: a = " + a.getName());
+        System.out.println("Before: b = " + b.getName());
+        swap(a, b);
+        System.out.println("After: a = " + a.getName());
+        System.out.println("After: b = " + b.getName());
+    }
+
+    public static void tripleValue(double x) {
+        x = 3 * x;
+        System.out.println("End of method: x = " + x);
+    }
+
+    public static void tripleSalary(Employee x) {
+        x.raiseSalary(200);
+        System.out.println("End of method: salary = " + x.getSalary());
+    }
+
+    public static void swap(Employee x, Employee y) {
+        Employee temp = x;
+        x = y;
+        y = temp;
+        System.out.println("End of method: x = " + x.getName());
+        System.out.println("End of method: y = " + y.getName());
+    }
+}
+
+class Employee {
+    private String name;
+    private double salary;
+
+    public Employee(String n, double s) {
+        name = n;
+        salary = s;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void raiseSalary(double byPercent) {
+        double raise = salary * byPercent / 100;
+        salary += raise;
+    }
+}
+
