1、用Java实现两个线程分别交替打印数字和字母，打印结果如：1 2 A 3 4 B …… Y 51 52 Z
public class TestThread {
public static TestThread mHandler=new TestThread();
public static TestThread getHander(){
return mHandler;
}
public TestThread() {
// TODO Auto-generated constructor stub
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TestThread t = new TestThread();
ThreadA threadA = t.new ThreadA();
ThreadB threadB = t.new ThreadB();
threadA.start();
threadB.start();
}
class ThreadA extends Thread{
private int num = 1;
@Override
public void run() {
// TODO Auto-generated method stub
super.run();
while(num<53){
synchronized(TestThread.this){ //synchronized(TestThread.getHander()){
System.out.print(num+" "+(num+1)+" ");
num+=2;
TestThread.this.notify();
if (num < 52){
try {
TestThread.this.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}
class ThreadB extends Thread{
private char ch = 'A';
@Override
public void run() {
// TODO Auto-generated method stub
super.run();
while(ch<='Z'){
synchronized(TestThread.this){ //synchronized(TestThread.getHander()){
System.out.print(ch+" ");
ch++;
TestThread.this.notify();
try {
TestThread.this.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}
2、将1至100一百个随机自然数，放入数组a中。用java实现获取当中重复次数最多，而且数是最大的一个，并打印出来。
Random ran = new Random();
int [] a=new int[100];
int [] b=new int[100];
for(int i=0;i<100;i++){
a[i]=Math.abs(ran.nextInt()%100);
System.out.print(a[i]+",");
}
System.out.println("----");
for(int i=0;i<100;i++){
b[a[i]]++;
}
for(int i=0;i<100;i++){
System.out.print(b[i]+",");
}
System.out.println("----");
int k=b[0],max=0;
for(int i=0;i<100;i++){
if(b[i]>=k){
k=b[i];
max=i;
System.out.println(max+"----"+k);
}
}
System.out.println(max+"----"+k);