blvyoucan的专栏

针对jdk8中的List.sort()Comparator(int a, int b)if( a < b ){ // 返回负数或0值，不交换 // 返回正数值，交换ab}if( a > b){ // 返回负数值，交换ab // 返回正数或0值，不交换}if( a == b ){ //返回非0值，会报异常Comparison method violates its general contract!}a - b//正序b - a//倒序Comparator(dou

public class TestClose implements AutoCloseable{ public int test(){ int x = 1; try{ x += 1; return x + 7; }catch (Exception e){ }finally ...

1.单线程性能对比2.多线程性能对比3.线程安全SimpleDateFormat4.线程安全DateTimeFormatter5.结论1.单线程性能对比import java.time.LocalDateTime;import java.time.format.DateTimeFormatter;import java.text.SimpleDateFormat...