import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btn1 = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button)findViewById(R.id.button1);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
File file = new File(Environment.getExternalStorageDirectory(), "eboy.txt");
OutputStream os = null;
try {
os = new FileOutputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
os.write("Hello eboy, Hello Frr.".getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast toast = Toast.makeText(MainActivity.this, "鍐欐枃浠跺埌SD鍗℃垚鍔熴俥boy.txt", Toast.LENGTH_SHORT);
toast.show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
]]>
* 鍦ㄤ嬌鐢ㄦ硾鍨嬫椂錛屽鏋滀袱杈瑰悓鏃剁敤鍒頒簡娉涘瀷錛屼袱杈瑰繀欏諱竴鑷達紝渚嬶細ArrayList<String> list = new ArrayList<String>();
* 鍦ㄤ嬌鐢ㄦ硾鍨嬫椂錛屽鏋滀粎涓杈圭敤鍒頒簡娉涘瀷錛岃繖鏄彲浠ョ殑錛屼負浜嗕繚鎸佸悜鍚庡吋瀹規(guī)э紝渚嬶細 ArrayList<String> list = new ArrayList(); ArrayList list = new ArrayList<String>();
*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Test;
public class generic {
public static void main(String[] args) {
List<String> list1 = new ArrayList<String>();
list1.add("bbb");
list1.add("cc");
list1.add("ddd");
list1.add("eeee");
list1.add("ffffd");
//鏂瑰紡1
Iterator<String> Strs = list1.iterator();
while (Strs.hasNext()){
System.out.println(Strs.next());
}
//鏂瑰紡2
for (String s : list1){
System.out.println(s);
}
Set<Integer> set = new HashSet<Integer>();
set.add(1);
set.add(2);
set.add(3);
set.add(4);
set.add(5);
set.add(8);
set.add(7);
//鏂瑰紡1
for (Integer i : set){
System.out.println(i);
}
Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "eboy");
map.put(2, "FRR");
map.put(3, "LJ");
//鏂瑰紡1
Set<Integer> set1 = map.keySet();
Iterator<Integer> it = set1.iterator();
while (it.hasNext()){
int key = it.next();
System.out.println(map.get(key));
}
//鏂瑰紡2
Set<Map.Entry<Integer, String>> set2 = map.entrySet();
Iterator<Map.Entry<Integer, String>> it2 = set2.iterator();
while (it2.hasNext()){
Map.Entry<Integer, String> entry = it2.next();
System.out.println(entry.getKey() + ": " + entry.getValue());
}
//鏂瑰紡3 1.5
for (Map.Entry<Integer, String> entry3 : map.entrySet()){
System.out.println(entry3.getKey() + ": " + entry3.getValue());
}
String arr[] = {"a", "b", "c", "d"};
System.out.println(arr[0]);
reverse(arr);
System.out.println(arr[0]);
}
//鍔犱釜@Text錛屽彲鐢↗Unit鍗曠嫭嫻嬭瘯test2鏂規(guī)硶
@Test
public void test2(){
int i;
i = 15;
String s;
s = "asfdsaf";
System.out.println("test" + i + s);
}
//鑷畾涔夋硾鍨嬶細鏂規(guī)硶鏄硾鍨?/span>
public static <T> void Test(T t){
}
//鑷畾涔夋硾鍨嬶細榪斿洖鍊兼槸娉涘瀷
public static <T, E> T Test1(T t, E e){
return null;
}
//娉涘瀷搴旂敤瀹炰緥錛氫氦鎹㈡暟緇勫厓绱?/span>
static <T> void swap(T arr[], int pos1, int pos2){
T temp = arr[pos1];
arr[pos1] = arr[pos2];
arr[pos2] = temp;
}
//娉涘瀷搴旂敤瀹炰緥錛氭帴鏀朵竴涓換鎰忔暟緇勶紝騫墮鍊掓暟緇勪腑鐨勬墍鏈夊厓绱?/span>
static <T> void reverse(T arr[]){
int pos1 = 0;
int pos2 = arr.length - 1;
T temp = null;
while (pos1 <= pos2){
temp = arr[pos1];
arr[pos1] = arr[pos2];
arr[pos2] = temp;
pos1++;
pos2--;
}
}
}
]]>
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class MouseKey {
public static void main(String[] args) {
Frame f = new Frame("榧犳爣鍗曞嚮浜嬩歡婕旂ず");
f.setBounds(400, 400, 640, 480);
f.setLayout(new FlowLayout());
Button btn = new Button("鍏抽棴");
f.add(btn);
btn.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
System.exit(0);
}
});
f.setVisible(true);
}
}
]]>