笔试凉经
选择题有一个重建二叉树,和一个堆给出进入的顺序,选不可能的出堆顺序(此题意思是先入堆的数字可能还没放新的数字就出去了,考虑到这一点就明白了)
另外就是一些类似牛客专项练习的java基础知识
另外有socket监听服务器的时候是socket还是socket server,这点确实不了解socket相关的东西
大题两个线程打印字母和文字
想到了用notify和wait,但是忘了多线程咋写了,写了两个四不像
还有一个脑筋急转弯是一个金条切两刀如何发七天工资,要求每天都有工资发,一直在想怎么两刀切七块,原来意思是领工资的时候可以拿前天小金条换一个大金条这种
结束后查到的参考代码如下
package cn.bridgeli.demo;
import com.google.common.collect.Lists;
import java.util.List;
/**
* @author BridgeLi
* @date 2021/2/6 16:14
*/
public class Thread_Communication_Notify_Wait {
public static void main(String[] args) {
final Object o = new Object();
final List<Integer> integers = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7);
final List<String> strings = Lists.newArrayList("A", "B", "C", "D", "E", "F", "G");
new Thread(() -> {
synchronized (o) {
integers.forEach(item -> {
System.out.print(item);
o.notify();
try {
o.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
});
o.notify();
}
}, "t1").start();
new Thread(() -> {
synchronized (o) {
strings.forEach(item -> {
System.out.print(item);
o.notify();
try {
o.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
});
o.notify();
}
}, "t2").start();
}
} public class testWait {
public static void main(String[] args) {
testWait testWait = new testWait();testWait.soutNumber();
testWait.soutChar();
}
public synchronized void soutNumber() {
for (int i = 0; i < 28; i++) {
System.out.println(i*2);
System.out.println(i*2+1);
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
this.notifyAll();
}
}
public synchronized void soutChar() {
for (int i = 0; i < 28; i++) {
char a= (char) ('a'+i);
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(a);
this.notifyAll();
}
}
} public class testWait {
public static void main(String[] args) {
new Thread(new SoutNumber()).start();
new Thread(new SoutChar()).start();
}
static class SoutNumber implements Runnable
{ @Override public synchronized void run() {
for (int i = 0; i < 28; i++) {
System.out.println(i*2);
System.out.println(i*2+1);
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
this.notifyAll();
}
}
}
static class SoutChar implements Runnable
{ @Override public synchronized void run() {
for (int i = 0; i < 28; i++) {
char a= (char) ('a'+i);
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(a);
this.notifyAll();
}
}
}
} #研发笔试##笔经#
查看23道真题和解析
5道手撕666，面试官找你刷题来了