參考原廠教材第4-31頁
public class Statistics{
public /* static */float average (int...nums){
int sum=0;
for(int x : nums){
sum += x;
}
return((float) sum) / nums.length;
}
public static void main(String [] args){
Statistics st = new Statistics();
//non-static方法無法直接呼叫static方法 必須new出來或者改成static
System.out.println(st.average(10,20,30,40,50));
}
}
哈哈
無聊亂寫的
不過大部分的CODE都是網路找到的
把字用成綠色，然後亂數重複個10000次感覺很像駭客任務呢
import java.util.*;
//中文亂碼產生器
public class Test {
public static void main(String[] args) {
System.out.println("請輸入要幾次 推薦10000次以上");
Scanner sc = new Scanner(System.in);
int p = sc.nextInt();
for(int i=0;i<p;i++){
RandomHan han = new RandomHan();
System.out.print(han.getRandomHan());
}
}
}
class RandomHan {
private Random ran = new Random();
private final static int delta = 0x9fa5 - 0x4e00 + 1;
public char getRandomHan() {
return (char)(0x4e00 + ran.nextInt(delta));
}
}
//亂碼產生程式(英文大寫)
import java.util.*;
public class p2 {
public static void main(String[] args) {
System.out.println("請輸入要幾次 推薦10000次以上");
Scanner sc = new Scanner(System.in);
int p = sc.nextInt();
int[] word = new int[p];
for(int i=0; i<word.length;i++){
word[i]=(int)(Math.random()*26)+65;
}
StringBuffer newPassword = new StringBuffer();
for(int j = 0; j < p ; j++){
newPassword.append((char)word[j]);
}
System.out.println(newPassword);
}
}
小寫我就不多說囉 把ASCI碼+32就是小寫，大小寫混用的話請想想看囉
//題目第1題
/*
輸出1+2+3+......+100的總和
*/
public class sn{
public static void main(String [] args){
int p=0;
for(int i=1 ; i<101 ; i++){
p = p+i;
}
System.out.println(p);
}
}
//題目第2題
/*
印出1~100每個整數 但是跳過尾數為6的整數
*/
public class six{
public static void main(String [] args){
for(int i=1 ; i<101 ; i++){
if(i%10==6){}else{
System.out.print(i+" ");
}
}
}
}
//題目第3題
/*印出
1 2 3 4 ......
1 2 3 4 .....
.
.
.
*/
public class onetwo{
public static void main(String [] args){
for(int i=1;i<4;i++){
for(int q=1; q<4 ;q++){
System.out.print(q);
}
System.out.println();
}
}
}
//題目第4題
/*
印出
1
1 2
1 2 3
1 2 3 4 ......
*/public class sss{
public static void main(String [] args){
for(int i=0;i<=10;i++){
for(int j=1;j<=i;j++){
System.out.print(j+" ");
}
System.out.println();
}
}
}
//題目第5題
/*
九九乘法表
*/
public class nn{
public static void main(String [] args){
for(int i=1 ; i<10 ; i++){
for(int a=2 ; a<10 ; a++){
System.out.print(a + "x" + i + "=" + a * i +"\t");
}
System.out.println();
}
}
}
之前早就想做出來了
可惜程式碼80%都不是我寫的
原本只有約分功能 我把它加進去最大公因數還有最小公倍數的功能
還有輸入的功能
期待以後可以用出個GUI介面 讓一切更方便
檔名：mainclass.java
import java.util.*;
class fenshu
{
private int up;
private int up1;
private int down ;
private int down1 ;
public fenshu(int a,int b)
{
up=a ;
down=b ;
}
public int getnumber()//求最大公约数
{
int min;
int tem=1;
min=(up<down)? up:down ;
for(int i=1;i<=min;i++)
{
if(up%i==0&&down%i==0)
tem=i ;
}
return tem ;
}
public void process()
{
up1=(int)(up/getnumber()) ;
down1=(int)(down/getnumber()) ;
}
public void showresult()
{
int fa = up/up1;
//System.out.println("result:"+up1+"/"+down1) ;
System.out.println("最大公因數="+fa) ;
System.out.println("最小公倍數="+fa*up1*down1) ;
System.out.println("約分的結果"+up1+"比"+down1) ;
if(up==up1){
System.out.println("※已經是最簡分數，無法約分！");
}
}
}public class mainclass
{
public static void main(String []s)
{
System.out.println("請輸入第一個數字");
Scanner sc = new Scanner(System.in);
int p = sc.nextInt();
System.out.println("請輸入第二個數字");
int q = sc.nextInt();
if (q>p)
{
int tmp1=0;
int tmp2=0;
tmp1 = p;
tmp2 = q;
p = tmp2;
q = tmp1;
}
fenshu fs=new fenshu(p,q) ;
fs.process() ;
fs.showresult() ;
}
}
原本想說弄個丁丁說你好的程式，之後就做成這樣子了。
import java.util.*;
public class test{
public static void main(String [] args){
System.out.println("請輸入您想說的話");
Scanner sc = new Scanner(System.in);
String x = sc.nextLine();
System.out.println("請輸入您想重複的次數");
int q = sc.nextInt();
System.out.println("是否換行，是請輸入1，否請輸入2");
int a = sc.nextInt();
System.out.println("是否顯示次數，是請輸入1，否請輸入2");
int b = sc.nextInt();
if(a==1&&b==1){
for(int i=0;i<q;i++){ //是是
int z = i+1;
System.out.println(x + " (這是第" + z + "次)");
}
}//end if
if(a==1&&b==2){
for(int i=0;i<q;i++){ //是否
int z = i+1;
System.out.println(x);
}
}//end if
if(a==2&&b==1){
for(int i=0;i<q;i++){ //否是
int z = i+1;
System.out.print(x + " (這是第" + z + "次)");
}
}//end if
if(a==2&&b==2){
for(int i=0;i<q;i++){ //否否
int z = i+1;
System.out.print(x);
}
}//end if
else{
System.out.println("輸入錯誤程式結束！");
}
}
}
下面兩個是一組的，要一起使用喔，(範例：老師)
public class Teacher{
private String name;
public Teacher(String name){
this.name = name;
}
public void teach(){
System.out.println(this.name + "正在教學");
}
public String getName(){
return this.name;
}
}
import java.util.*;
public class TestTeacher{
public static void main(String [] args){
System.out.println("請輸入老師姓名");
Scanner sc = new Scanner(System.in);
//String a = s.nextString();
String a = sc.nextLine();
Teacher teacher1 = new Teacher(a);
System.out.println("老師姓名；" + teacher1.getName());
teacher1.teach();
}
}
可以拖拉之後顯示滑鼠位置
可以讓人理解 電腦中X軸右+左- Y軸下+上- (我沒搞錯跟數學的不一樣)
package dragged;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;public class TestMouseDragged{
int x,y ;
int x0,y0 ;
JButton btn=new JButton("可拖拉許功蓋");
public TestMouseDragged(){
JFrame f = new JFrame("許功蓋");
f.setLayout(new FlowLayout(FlowLayout.CENTER));
btn.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent me){
x0 = me.getX();
y0 = me.getY();
System.out.println("mouse click-x0="+x0+"y0="+y0);
}
});
btn.addMouseMotionListener(new MouseAdapter(){
public void mouseDragged(MouseEvent me){
int x = btn.getX()+me.getX() - x0;
int y = btn.getY()+me.getY() - y0;
btn.setLocation(x,y);
System.out.println("mouse X位置="+x+"Y位置"+y);
}
});
f.add(btn);
f.pack();
f.setSize(600,600);
f.setVisible(true);
}
public static void main(String [] args){
new TestMouseDragged();
}
}
兩個很好玩的JAVA
看來IO真的很好玩
讀取檔案
package iostream;
import java.io.*;
public class FileIOStream{
public static void main(String [] args)throws IOException{
FileInputStream fis = new FileInputStream("FileIOStream.java");//輸入檔案的名稱
byte[] b = new byte[fis.available()];
fis.read(b);
FileOutputStream fos = new FileOutputStream("FileIOStream2.java");//輸出檔案的名稱
fos.write(b);
fos.flush();
fos.close();
fis.close();
}
}
package reader;
import java.io.*;
public class FileIOReader {
public static void main(String [] args)throws IOException{
FileReader fr = new FileReader("FileIOStream.java");//要讀取的檔案
BufferedReader br = new BufferedReader(fr);
String temp = null ;
while((temp = br.readLine())!=null)
System.out.println(temp);
br.close();
}
}
package _class; import _interfaces.*; public class InterfaceDemoImpl implements InterfaceDemo{ public void testA(){ System.out.println("testA()"); } public String testB(){ return "testB()"; } public static void main(String [] args){ InterfaceDemoImpl i=new InterfaceDemoImpl(); i.testA(); System.out.println(i.testB()); //InterfaceDemoImpl.a=10000; //以上註解拿掉就會過不了 } }
package exception;
class CustomException extends Exception{
public CustomException(){
super("自訂例外");
}
public CustomException(String msg){
super(msg);
}
}
public class TestCustomException{
public static void main(String [] args){
try{
throw new CustomException();
}catch (CustomException ce ){
ce.printStackTrace();
}
}
}
package exception; import java.util.Scanner ; import java.io.*; class ExceptionFather{ public String readString() throws FileNotFoundException{ Scanner s = new Scanner (new File("input.txt")); return "ExceptionFather -"+ s.next() ; } } class ExceptionSon extends ExceptionFather{ @Override public String readString() { Scanner s=null; String temp=null; try{ s=new Scanner(new File ("input.txt")); temp="ExceptionSon-"+s.next(); }catch (FileNotFoundException fnfe ){ System.out.println("例外="+fnfe.toString()); }finally { System.out.println("Finally"); } return temp; } } public class TestException{ public static void main(String [] args){ ExceptionSon s=new ExceptionSon(); System.out.println(s.readString()); try{ ExceptionFather f=new ExceptionFather(); System.out.println(f.readString()); }catch(FileNotFoundException fnfe){ fnfe.printStackTrace(); } } }
