奎河少年
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奎河少年：
MauerSu 写道httpClient是哪个 版本的啊 4. ...
HttpTool工具类 -
MauerSu：
httpClient是哪个 版本的啊
HttpTool工具类
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import java.lang.reflect.Field;
public class TestPrivate2 {
public static void main(String[] args) throws Exception {
Private2 p = new Private2();
Class classType = p.getClass();
Field field = classType.getDeclaredField("username");
field.setAccessible(true);
field.set( ...
import java.lang.reflect.Method;
public class TestPrivate {
public static void main(String[] args) throws Exception {
Private p = new Private();
Class classType = p.getClass();
Object obj = classType.newInstance();
Method method = classType.getDeclaredMethod("echo",
n ...
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class ReflectionTester {
@SuppressWarnings("unchecked")
public Object objectCopy(Object object) throws Exception {
Class<?> classType = object.getClass();
C ...
import java.lang.reflect.Method;
public class DumpMethod {
public int add(int a, int b) {
return a + b;
}
public String echo(String message) {
return "Hello" + " " + message;
}
public static void main(String[] args) throws Exception {
Class<?> cla ...
打印出三位的水仙花数
- 博客分类：
- java基础
public class Shuixianhuashu {
public static void main(String[] args) {
for (int i = 100; i <= 999; i++) {
int baiwei = i / 100;
int shiwei = (i - (baiwei * 100)) / 10;
int gewei = i - baiwei * 100 - shiwei * 10;
if (i == (Math.pow(gewei, 3) + Math.pow(shiwei, 3) + Math.pow(
...
import java.util.Random;
//求每个数字出现的次数、出现次数最多的数、出现最大次数的值的数字
public class RandomTest2 {
public static void main(String[] args) {
int[] count = new int[41];
Random random = new Random();//产生随机数
for(int i=0;i<50;i++){
int number = random.nextInt(41)+10;//产生随机数[10,50]
System.out.p ...
判断命令行输入的参数的个数
- 博客分类：
- java基础
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
public class MapTest3 {
public static void main(String[] args) {
HashMap hashMap = new HashMap();
for(int i=0;i<args.length;i++){
if(hashMap.get(args[i]) == null){
hashMap.put(args[i], new Integer(1 ...
用entrySet遍历Map
- 博客分类：
- java基础
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class MapTest4 {
public static void main(String[] args) {
HashMap map = new HashMap();
map.put("1", "a");
map.put("2", "b");
map.pu ...
用keySet遍历Map
- 博客分类：
- java基础
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
public class MapTest2 {
public static void main(String[] args) {
HashMap hashMap = new HashMap();
hashMap.put("1", "a");
hashMap.put("2", "b");
hashMap.put(" ...
public class TestRandom {
public static void main(String[] args) throws Exception {
typeTextByRandom("data/data1.txt");
}
public static void typeTextByRandom(String fileName) {
RandomAccessFile raf = null;
try {
raf = new RandomAccessFile(fileName, "r");
...
java非递归 实现斐波那契数列
- 博客分类：
- java基础
public class TestFib2 {
public static void main(String[] args){
int value = f(4);
System.out.println("value="+value);
}
public static int f(int x){
if(x==1 || x==2){
return 1;
}else{
int f1 = 1;
int f2 = 1;
int f = 0;
for(int i=0;i<x-2;i++){ ...
java实现二分法查找
- 博客分类：
- java基础
public class TestBinsarySearch {
int leftIndex = 0;
int rightIndex = 0;
int findVal = 0;
public static int binarySearch(int[] arr,int leftIndex,int rightIndex,int findVal){
if(leftIndex > rightIndex){
return -1;
}
int midIndex = (leftIndex + rightIndex)/2;
int m ...
java递归实现斐波那契数列
- 博客分类：
- java基础
public class TestFib {
public static void main(String[] args) {
int n = f(5);
System.out.println(n);
}
public static int f(int x){
if(x==1 || x==2){
return 1;
}else{
return f(x-1)+f(x-2);
}
}
}
java实现冒泡排序
- 博客分类：
- java基础
public class TestBubbleSort{
public static int[] bubbleSort(int[] arr){
for(int i=0;i<arr.length-1;i++){
boolean flag = false;
for(int j=0;j<arr.length-i-1;j++){
if(arr[j] > arr[j+1]){
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
flag = tr ...
import java.sql.*;
public class DBUtil {
public static Connection getConnection(){
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/test","root","root");
} c ...