Download 09F-NoteSet09b

CSE 1341 Honors
Professor Mark Fontenot
Southern Methodist University
Note Set 09
More Methods
public static void main (String [] args) {
int val = getSecretNum(25, 8);
System.out.println(val);
val = getSecretNum(12, 3);
System.out.println(val);
val = getSecretNum(5, 10);
System.out.println(val);
}
public int getSecretNum(int a, int b) {
if (a == 3){
Only one of the return
return b + 2;
statements in a method will
} else if (a > 10 && a < 20) {
execute.
return b + 4;
} else if (a >= 20) {
A return stmt can only return
return b + 6;
one value.
} else {
return b + 8;
}
}
More Methods
public static void main (String [] args) {
int val = getSecretNum(25, 8);
System.out.println(val);
val = getSecretNum(12, 3);
System.out.println(val);
val = getSecretNum(5, 10);
System.out.println(val);
}
public int getSecretNum(int a, int b) {
if (a == 3){
Remember: Both conditions
return b + 2;
must be true for the
} else if (a > 10 && a < 20) {
entire expression to be true.
return b + 4;
} else if (a >= 20) {
return b + 6;
} else {
return b + 8;
}
}
More Methods
public static void main (String [] args) {
int val = getSecretNum(25, 8);
System.out.println(val);
val = getSecretNum(12, 3);
System.out.println(val);
val = getSecretNum(5, 10);
System.out.println(val);
}
public int getSecretNum(int a, int b) {
if (a == 3){
return b + 2;
Remember: Both conditions
} else if (a > 10 && a < 20) {
must be true for the
return b + 4;
entire expression to be true.
} else if (a >= 20) {
return b + 6;
} else {
return b + 8;
}
}
More Methods
public static void main (String [] args) {
int val = getSecretNum(25, 8);
System.out.println(val);
val = getSecretNum(12, 3);
System.out.println(val);
val = getSecretNum(5, 10);
System.out.println(val);
}
public int getSecretNum(int a, int b) {
if (a == 3){
return b + 2;
} else if (a > 10 && a < 20) {
return b + 4;
} else if (a >= 20) {
return b + 6;
} else {
return b + 8;
}
}
Output:
More Than One Method
public class TestClass {
public static int method1(int total) {
return total + 10;
}
public static int method2(int t) {
return t * 2;
}
public static void main (String [] args) {
System.out.println(method2(10));
System.out.println(“Hello “ + method1(500));
System.out.println(method1(method2(10)));
}
}
More Than One Method
public class TestClass {
public static int method1(int total) {
return total + 10;
}
public static int method2(int t) {
return t * 2;
}
public static void main (String [] args) {
System.out.println(method2(10));
System.out.println(“Hello “ + method1(500));
System.out.println(method1(method2(10)));
}
}
Note: You can embed a method call inside
another method call.
Random Number Generation
• Java Random object can generate
(pseudo)random numbers.
• Based on a function with very long period.
public static void main (String[] args) {
Random r = new Random();
r is a Random object that can
generate pseudorandom numbers
System.out.println(r.nextInt());
System.out.println(r.nextInt());
int x = r.nextInt(50);
}
nextInt is a method in Random
that returns a pseudorandom integer.
If you send an argument to nextInt,
the number it returns will be between 0 (incl)
and argument’s value (excl). [0 – 49] in this case