simple java(十)---methods(functions)(2)

用functions來寫的比較大小.

例一.

import javax.swing.*;

public class Maximum {

public static void main(String args[]) {

String s1 = JOptionPane.showInputDialog("Enter first value");

String s2 = JOptionPane.showInputDialog("Enter second value");

int number1 = Integer.parseInt(s1);

int number2 = Integer.parseInt(s2);

int maxvalue = max(number1, number2);

System.out.println("The max value is: " + maxvalue);}

public static int max(int x, int y){

return (x > y) ? x : y;}}

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例二.

class PassByValue {

public static void main(String s[]) {

int a=1, b=2;

System.out.println("a=" + a + " b=" + b);

swap(a, b);

System.out.println("a=" + a + " b=" + b);}

public static void swap(int x, int y) {

int temp = x;

x = y;

y = temp;

}}

執行結果:

a=1 b=2

a=1 b=2

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Scope Rules Example

class PassByValue {

public static void main(String s[]) {

int a=1, b=2, temp=0;

swap(a, b);

System.out.println("a=" + a + " b=" + b);

System.out.println("temp=" + temp);}public static void swap(int x, int y) {int temp= x;x = y;y = temp;}}

執行結果..

a=1 b=2

temp=0