public class Admins implements Userinterface{
private String name;
private String password;
private static int userNum;
public Admins() {
userNum ++;
}
public Admins(String name, String password) {
thisname = name;
thispassword = password;
userNum ++;
}
public void setPassword(String password) {
thispassword = password;
}
public String getPassword() {
return thispassword;
}
public String toString() {
return "Total: " + AdminsuserNum + "\nName: " + thisname + "\nPassword: " + thispassword;
}
public static void main(String [] args) {
Userinterface [] users = new Userinterface[]{new Admins("jeryy", "11111"), new Admins("green", "123123")};
for(Userinterface u: users) {
Systemoutprintln(u);
}
}
}
interface Userinterface{
public void setPassword(String password);
public String getPassword();
public String toString();
}
public class Bins{
public static void main(String [] args) {
int len = 10;
int [] dist = new int [len];
for(int i = 0; i < distlength; i ++) {
dist[i] = (int)(Mathrandom() 100);
}
javautilArrayssort(dist);
Systemoutprintln("生成数组如下: ");
for(int i: dist) {
Systemoutprint(i + "\t");
}
javautilScanner san = new javautilScanner(Systemin);
Systemoutprint("输入要查找的数: ");
int key = sannextInt();
int res = BinsbinSearch(dist, key);
//Systemoutprintln(res);
String info = (res >=0 ) (key + ":" + res) : "查找失败";
Systemoutprintln(info);
}
public static int binSearch(int [] dist, int key) {
javautilArrayssort(dist);
return javautilArraysbinarySearch(dist, key);
}
}
public class Test {
public static void main(String[] args) {
// 定义数组
int[][] array = new int[5][6];
// 生成随机数初始化数组
for (int i = 0; i < arraylength; i++) {
for (int j = 0; j < array[i]length; j++) {
array[i][j] = (int) (40 Mathrandom()) + 10;
}
}
// 输出数组
for (int i = 0; i < arraylength; i++) {
for (int j = 0; j < array[i]length; j++) {
Systemoutprint(array[i][j] + "\t");
}
Systemoutprintln(); // 换行
}
}
}
您好，写了一个程序，求素数，并将所有素数存到ArrayList sushu中：
import javautilArrayList;
import javautilzipInflater;
public class sushu {
public static void main(String[] args) {
int n=50,b=0;
float a=0,c=0;
ArrayList sushu=new ArrayList();
for(int i=3;i<=n;i++){
int state=0;
for(int j=2;j<(i/2+1);j++){
a=(float)i/(float)j;
//Systemoutprintln(a);
b=(int)a;
//Systemoutprintln(a-b);
c=a-b;
//Systemoutprintln(c);
if(c==0){state=1;break;}
}
if(state==0)sushuadd(i);
}
Systemoutprintln(sushu);
}
}
输出结果为：[3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]
package comdemo;
import javaawtBorderLayout;
import javaawtDimension;
import javaawteventActionEvent;
import javaawteventActionListener;
import javautilTimer;
import javautilTimerTask;
import javaxswingJButton;
import javaxswingJFrame;
import javaxswingJTextField;
public class TimerTest {
private Timer timer;
private JTextField field;
private JButton button;
private boolean flag = true;
public TimerTest() {
timer = new Timer();
addview();
}
private void addview() {
JFrame frame = new JFrame("Timer test");
field = new JTextField();
fieldsetPreferredSize(new Dimension(0, 30));
button = new JButton("start");
buttonsetPreferredSize(new Dimension(100, 30));
buttonaddActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (flag) {
auto();
flag = false;
buttonsetText("stop");
} else {
timercancel();
flag = true;
buttonsetText("start");
}
}
});
frameadd(field, BorderLayoutCENTER);
frameadd(button, BorderLayoutEAST);
framesetBounds(200, 200, 300, 60);
framesetVisible(true);
framesetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TimerTest();
}
private void auto() {
timerschedule(new TimerTask() {
@Override
public void run() {
int num = IntegerparseInt(fieldgetText()trim());
num += 1;
fieldsetText(num + "");
auto();
}
}, 1000);
}
}
给你个做好了的Java的源程序的记事本，自己看看就行了的，不怎么难的···
import javaawt;
import javaawtevent;
import javaio;
import javaxswing;
public class MyNotepad implements ActionListener{
private JFrame frame=new JFrame("新记事本");
private JTextArea jta=new JTextArea();
private String result="";
private boolean flag=true;
private File f;
private JButton jb=new JButton("开始");
private JTextField jtf=new JTextField(15);
private JTextField jt=new JTextField(15);
private JButton jbt=new JButton("替换为");
private JButton jba=new JButton("全部替换");
private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11gif");
private String value;
private int start=0;
private JFrame jf=new JFrame("查找");
private JFrame jfc=new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm=egetActionCommand();
if("新建"equals(comm)){
if(!(framegetTitle()equals("新记事本"))){
if(!flag){
write();
newNew();
}else{
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfcshowDialog(null,"保存为");
if(returnVal == JFileChooserAPPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfcgetSelectedFile();
flag=false;
write();
}
}
}else if(!(jtagetText()isEmpty())){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfcshowDialog(null,"保存为");
if(returnVal == JFileChooserAPPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfcgetSelectedFile();
flag=false;
write();
newNew();
}
}else{
newNew();
}
}else if("打开"equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
jfcsetDialogType(JFileChooserOPEN_DIALOG);
int returnVal = jfcshowOpenDialog(null);
if(returnVal == JFileChooserAPPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfcgetSelectedFile();
framesetTitle(fgetName());
result=read();
flag=false;
value=result;
jtasetText(result);
}
}else if("保存"equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
if(flag){
int returnVal = jfcshowDialog(null,"保存为");
if(returnVal == JFileChooserAPPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfcgetSelectedFile();
flag=false;
write();
}
}else{
write();
}
}else if("另存"equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfcshowDialog(null,"另存");
if(returnVal == JFileChooserAPPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfcgetSelectedFile();
write();
}
}else if("退出"equals(comm)){
Systemexit(0);
}else if("撤销"equals(comm)){
jtasetText(value);
}else if("剪切"equals(comm)){
value=jtagetText();
jtacut();
}else if("复制"equals(comm)){
jtacopy();
}else if("粘贴"equals(comm)){
value=jtagetText();
jtapaste();
}else if("删除"equals(comm)){
value=jtagetText();
jtareplaceSelection(null);
}else if("全选"equals(comm)){
jtaselectAll();
}else if("查找"equals(comm)){
value=jtagetText();
jfadd(jtf,BorderLayoutCENTER);
jfadd(jb,BorderLayoutSOUTH);
jfsetLocation(300,300);
jfpack();
jfsetVisible(true);
jfsetDefaultCloseOperation(JFrameDISPOSE_ON_CLOSE);
}else if("替换"equals(comm)){
value=jtagetText();
GridLayout gl=new GridLayout(3,3);
JLabel jl1=new JLabel("查找内容:");
JLabel jl2=new JLabel("替换为:");
jfcsetLayout(gl);
jfcadd(jl1);
jfcadd(jtf);
jfcadd(jb);
jfcadd(jl2);
jfcadd(jt);
jfcadd(jbt);
JLabel jl3=new JLabel();
JLabel jl4=new JLabel();
jfcadd(jl3);
jfcadd(jl4);
jfcadd(jba);
jfcsetLocation(300,300);
jfcpack();
jfcsetVisible(true);
jfcsetDefaultCloseOperation(JFrameDISPOSE_ON_CLOSE);
}else if("版本"equals(comm)){
JDialog jd=new JDialog(frame,"关于对话框");
jdsetSize(200,200);
JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jdadd(l,BorderLayoutCENTER);
jdsetLocation(100,200);
jdsetSize(300,300);
jdsetVisible(true);
// jdpack();
jdsetDefaultCloseOperation(JDialogDISPOSE_ON_CLOSE);
}else if("开始"equals(comm)||"下一个"equals(comm)){
String temp=jtfgetText();
int s=valueindexOf(temp,start);
if(valueindexOf(temp,start)!=-1){
jtasetSelectionStart(s);
jtasetSelectionEnd(s+templength());
jtasetSelectedTextColor(ColorGREEN);
start=s+1;
jbsetText("下一个");
// value=valuesubstring(s+templength());//不能截取字串
}else {
JOptionPaneshowMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jfdispose();
}
}else if("替换为"equals(comm)){
String temp=jtfgetText();
int s=valueindexOf(temp,start);
if(valueindexOf(temp,start)!=-1){
jtasetSelectionStart(s);
jtasetSelectionEnd(s+templength());
jtasetSelectedTextColor(ColorGREEN);
start=s+1;
jtareplaceSelection(jtgetText());
}else {
JOptionPaneshowMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jfdispose();
}
}else if("全部替换"equals(comm)){
String temp=jtagetText();
temp=tempreplaceAll(jtfgetText(), jtgetText());
jtasetText(temp);
}
}
public String read(){
String temp="";
try {
FileInputStream fis = new FileInputStream(fgetAbsolutePath());
byte[] b=new byte[1024];
while(true){
int num=fisread(b);
if(num==-1)break;
temp=temp+new String(b,0,num);
}
fisclose();
} catch (Exception e1) {
e1printStackTrace();
}
return temp;
}
public void write(){
try {
FileOutputStream fos=new FileOutputStream(f);
foswrite(jtagetText()getBytes());
fosclose();
} catch (Exception e) {
eprintStackTrace();
}
}
public void newNew(){
framedispose();
new MyNotepad();
flag=true;
}
public MyNotepad(){
JMenuBar jmb=new JMenuBar();
String[] menuLab={"文件","编辑","帮助"};
String[][] menuItemLab={{"新建","打开","保存","另存","退出"},
{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},
{"版本"}};
for(int i=0;i<menuLablength;i++){
JMenu menu=new JMenu(menuLab[i]);
jmbadd(menu);
for(int j=0;j<menuItemLab[i]length;j++){
JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);
menuadd(jmi);
jmiaddActionListener(this);
}
}
framesetJMenuBar(jmb);
jtasetLineWrap(true);//自动换行
JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板
frameadd(jsp);
jbaddActionListener(this);
jbtaddActionListener(this);
jbaaddActionListener(this);
framesetLocation(200,50);
framesetSize(620,660);
framesetVisible(true);
framesetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyNotepad();
}
}
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