什么是套牢,墨纸 音译歌词,电吹风维修
试题如下：
参考答案：
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import java.io.filenotfoundexception;
import java.io.ioexception;
import java.util.arraylist;
import java.util.concurrent.executorservice;
import java.util.concurrent.executors;
/**
* created by ysc on 7/26/16.
*/
public class interview {
private static void one(){
string str1 = "hello";
string str2 = "he"+new string("llo");
system.err.println(str1==str2);
system.out.println("1. false");
}
private static void two(){
int i = integer.max_value;
system.err.println((i+1)<i);
system.out.println("2. 存在一个i, 使得(i+1)<i");
}
private static void three(){
system.err.println("gc is not a java thread, it is a native thread");
thread.getallstacktraces().keyset().foreach(thread -> system.out.println(thread.getname()+"->"+thread.isdaemon()+" "+thread.getpriority()));
system.out.println("3. gc线程是daemon线程");
}
private static volatile int count = 0;
private static void four(){
executorservice executorservice = executors.newcachedthreadpool();
for(int j=0; j<10; j++){
executorservice.submit(()->{
for(int i=0; i<1000000; i++){
count++;
}
});
}
system.out.println("count should be: "+10000000+", actual be: "+count);
system.out.println("4. volatile不能保证线程安全");
}
private static void five(){
arraylist<integer> list = new arraylist<>(20);
list.add(1);
system.out.println("debug code, not execute grow method");
system.out.println("5. list grow 0 times");
}
private static void six() {
system.out.println("bufferedreader's constructor only accepts a reader instance");
system.out.println("6. new bufferedreader(new fileinputstream(\"a.dat\")); is wrong");
}
private static void seven() {
try{
if(true){
throw new ioexception();
}
}catch (filenotfoundexception e){
system.out.print("filenotfoundexception!");
}catch (ioexception e){
system.out.print("ioexception!");
}catch (exception e){
system.out.print("exception!");
}
system.out.println("\n7. ioexception!");
}
private static void eight() {
system.out.println("string s;system.out.println(s); error: variable s might not have been initialized\nrecompile with -xlint:unchecked for details.");
system.out.println("8. 由于string s没有初始化, 代码不能编译通过");
}
private static void nine() {
system.out.println("5"+2);
system.out.println("9. 52");
}
private static void ten() {
int i = 2;
int result = 0;
switch(i){
case 1:
result = result + i;
case 2:
result = result + i * 2;
case 3:
result = result + i * 3;
}
system.out.println("result="+result);
system.out.println("10. 10");
}
private static class null{
public static void hello(){
system.out.println("hello");
}
public static void main(string[] args) {
((null)null).hello();
null _null = (null)null;
_null.hello();
}
}
private static class stringexample1{
string str = new string("good");
char[] ch = {'a', 'b', 'c'};
public void change(string str, char[] ch){
str = "test ok";
ch[0] = 'g';
}
public static void main(string[] args) {
stringexample1 ex = new stringexample1();
ex.change(ex.str, ex.ch);
system.out.print(ex.str+" and ");
system.out.print(ex.ch);
system.out.println();
}
}
private static class stringexample2{
public static void change(string str){
str = "welcome";
}
public static void main(string[] args) {
string str = "1234";
change(str);
system.out.println(str);
}
}
private static class forloop{
static boolean foo(char c){
system.out.print(c);
return true;
}
public static void main(string[] args) {
int i=0;
for(foo('a');foo('b')&&(i<2);foo('c')){
i++;
foo('d');
}
system.out.println();
}
}
private static class helloa{
public helloa(){
system.out.println("helloa");
}
{ system.out.println("i'm a class"); }
static {
system.out.println("static a");
}
}
private static class hellob extends helloa{
public hellob(){
system.out.println("hellob");
}
{ system.out.println("i'm b class"); }
static {
system.out.println("static b");
}
public static void main(string[] args) {
system.out.println("main start");
new hellob();
new hellob();
system.out.println("main end");
}
}
public static void main(string[] args) {
one();
two();
three();
four();
five();
six();
seven();
eight();
nine();
ten();
null.main(null);
stringexample1.main(null);
stringexample2.main(null);
forloop.main(null);
hellob.main(null);
}
}
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