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How do you find the sum of all the numbers in an array in Java?
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In java-8 you can use streams:
int[] a = {10,20,30,40,50};
int sum = IntStream.of(a).sum();
System.out.println("The sum is " + sum);
Output:
The sum is 150.
It's in the package java.util.stream
import java.util.stream.*;
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Postgres: clear entire database before re-creating / re-populating from bash script
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edited May 24 '10 at 9:05
answered Jan 13 '10 at 14:12
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finding and replacing elements in a list
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>>> a= [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1]
>>> for n, i in enumerate(a):
... if i == 1:
... a[n] = 10
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>>> a
[10, 2, 3, 4, 5, 10, 2, 3, 4, 5, 10]
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Can you change what a symlink points to after it is created?
....txt ln -s -f .bash_aliases test
$ grep -C3 ^unlink /tmp/output.txt
lstat64("test", {st_mode=S_IFLNK|0777, st_size=7, ...}) = 0
stat64(".bash_aliases", {st_mode=S_IFREG|0644, st_size=2043, ...}) = 0
symlink(".bash_aliases", "test") = -1 EEXIST (File exists)
unlink("test") ...
How to avoid null checking in Java?
...tion). Assertions are a highly-underused Java feature that was added in 1.4. The syntax is:
assert <condition>
or
assert <condition> : <object>
where <condition> is a boolean expression and <object> is an object whose toString() method's output will be included ...
Pairs from single list
... section.
– Apalala
Jan 7 '11 at 18:40
@Apalala: zip does advance the same iterator twice.
– Joc...
Install a .NET windows service without InstallUtil.exe
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Ian Kemp
21.9k1414 gold badges9393 silver badges116116 bronze badges
answered Oct 31 '08 at 21:49
Marc Gravell♦Mar...
Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
...version and thus not conform e.g. 2.5 version or lower. Below is a Servlet 4.0 compatible one (which matches Tomcat 9+, WildFly 11+, Payara 5+, etc).
<?xml version="1.0" encoding="UTF-8"?>
<web-app
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSche...