小编jus*_*Guy的帖子

似乎parseDouble可以接受带有尾随空格的字符串,但是parseInt和parseLong会抛出异常.

例如,对于这个测试用例

@Test
public void testNumberParsing() {
    try {
        Double.parseDouble("123.0 ");
        System.out.println("works");
    }catch (NumberFormatException e) {
        System.out.println("does not work");
    }
    try {
        Integer.parseInt("123 ");
        System.out.println("works");
    }catch (NumberFormatException e) {
        System.out.println("does not work");
    }
    try {
        Long.parseLong("123 ");
        System.out.println("works");
    }catch (NumberFormatException e) {
        System.out.println("does not work");
    }
}

结果是

works
does not work
does not work

为什么行为不同？这是故意的吗？

Kafka更新zookeeper中的状态信息,如下所示._epoch数字究竟意味着什么？Kafka文档似乎没有很好的解释条款.

[zk: localhost:2181(CONNECTED) 69] get /brokers/topics/my-topic/partitions/1/state
{"controller_epoch":29,"leader":2,"version":1,"leader_epoch":28,"isr":[2,1,0]}