Java Fundamentals Cheat Sheet by sschaub

If Statement
if ( expression ) {
 ­ statements
} else if ( expression ) {
 ­ statements
} else {
 ­ statements
}

While Loop
while ( expression ) {
 ­ statements
}

Do-While Loop
do {
 ­ statements
} while ( expression );

For Loop
for ( int i = 0; i < max; ++i) {
 ­ statements
}

For Each Loop
for ( var : collection ) {
 ­ statements
}

Switch Statement
switch ( expression ) {
 ­ case value:
 ­ ­ ­ statements
 ­ ­ ­ ­break;
 ­ case value2:
 ­ ­ ­ statements
 ­ ­ ­ ­break;
 ­ ­def­ault:
 ­ ­ ­ statements
}

Exception Handling
try {
 ­ ­sta­tem­ents;
} catch (Except­ionType e1) {
 ­ ­sta­tem­ents;
} catch (Exception e2) {
 ­ ­cat­ch-all statem­ents;
} finally {
 ­ ­sta­tem­ents;
}

String to Number
int i = Intege­r.p­ars­eInt(str);
double d = Double.pa­rse­Double(str);

Any Type to String
String s = String.va­lueOf(value);

Numeric Conver­sions
int i = (int) numeric expression;

import java.u­til.Date;

public class Hello {
 ­ ­public static void main(S­tring[] args) {
 ­ ­ ­ ­Sys­tem.ou­t.p­rin­tln­("Hello, world!­");
 ­ ­ ­ Date now = new Date();
 ­ ­ ­ ­Sys­tem.ou­t.p­rin­tln­("Time: " + now);
 ­ }
}

printf style formatting
System.ou­t.p­rin­tf(­"­Count is %d\n", count);
s = String.fo­rma­t("Count is %d", count);

Messag­eFormat style formatting
s = Messag­eFo­rma­t.f­ormat(
 ­ ­"At {1,time}, {0} eggs hatche­d.",
 ­ 25, new Date());

Individual Numbers and Dates
s = Number­For­mat.ge­tCu­rre­ncy­Ins­tance()
 ­ .fo­rma­t(x);
s = new Simple­Dat­eFo­rma­t(""h:mm a"")
 ­ .fo­rma­t(new Date());
s = new Decima­lFo­rma­t("#­,##­0.0­0")
 ­ .fo­rma­t(1­25.32);