Haifeng Zhang

Haifeng Zhang has asked 33 questions and find answers to 66 problems.

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When performance matters, professionals practice.

My Site | haifzhan[at]gmail[dot]com

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Haifeng Zhang questions

Object oriented Design: Scalable and maintainable car store system
PUT/DELETE got 403 Error but GET/POST works
Why containsKey() of Map only invoke hashCode()?
Canada Post Rates Error in Ionic Project Response for preflight has invalid HTTP status code 500
How to disable console.log() on production and display a banner?
How to map Java/Kotlin string array and Postgres SQL array with JPA and hibernate
Ionic3 ionic native google maps doesn't show map but only google logo (display grey blank map )
Race conditions "check-then-act" and "read-modify-write"
cairocffi install failed on Ubuntu 18.04
Canvas charts is blurry when download as PDF

Haifeng Zhang answers

How do I make multi replace() java
print first four columns but afterwards every forth column
Linux grep command
Truncate Float value up to two decimal point in java
Angular5 - Change parent's property from child component's input's [(ngModel)] binding
How to create a dictionary in java, similar to the ones in python? [duplicate]
Getting SQL error SQL State S1009
Python - Multiprocessing - More jobs that cpus.
FInding Value from excel sheet in python
Replicating "tail -f" with Python