文档介绍：Java Quick Reference
Console Input GUI Input Dialog
Scanner input = new Scanner(); String string = (
int intValue = (); "Enter input");
long longValue = (); int intValue = (string);
double doubleValue = (); double doubleValue =
float floatValue = (); (string);
String string = ();
Message Dialog
Console Output
(null,
(anyValue); "Enter input");
Primitive Data Types Arithmetic Operators Assignment Operators
byte 8 bits + addition = assignment
short 16 bits - subtraction += addition assignment
int 32 bits * multiplication -= subtraction assignment
long 64 bits / division *= multiplication assignment
float 32 bits % remainder /= division assignment
double 64 bits ++var preincrement %= remainder assignment
char 16 bits --var predecrement
boolean true/false var++ postincrement
var-- postdecrement
Relational Operators Logical Operators if Statements
< less than && short circuit AND if (condition) {
<= less than or equal to || short circuit OR statements;
> greater than ! NOT }
>= greater than or equal to ^ exclusive OR
== equal to if (condition) {
!= not equal statements;
}
else {
switch Statements loop Statements statements;
}
switch (intExpression) { while (condition) {
case value1: statements; if (condition1) {
statements; } statements;
break; }
... do { else if (condition2) {
case valuen: statements; statements;
statements; } while (condition); }
break; else {
default: for (init; condition; statements;
statements; adjustment) { }
} statements;
}
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Java Quick Reference
Frequently Used Static Constants/Methods Array/Length/Initializer
int[] list = new int[10];
() ;
(a, b) int[] list = {1, 2, 3, 4};
()
(anyValue) Mul