java笔记学习之操作符
作者：followWinter
本篇文章给大家分享了关于Java中操作符的相关知识点以及难点总结，有需要的朋友参考学习下吧。
0x001 算数运算符
int num1 = 1, num2 = 2;
System.out.println(num1 + num2); // 3
System.out.println(num1 - num2); // -1
System.out.println(num1 / num2); // 0
System.out.println(num1 * num2); // 2
System.out.println(num1 % num2); //1
0x002 自增自减
System.out.println(num1++); // 1
System.out.println(num1); // 2
System.out.println(num1--); // 2
System.out.println(num1); // 1
System.out.println(++num1); // 2
System.out.println(--num1); // 1
0x003 关系操作符
System.out.println((num1 < num2)); // true
System.out.println((num1 > num2)); // false
System.out.println(num1 == num2); // false
System.out.println(num1 != num2); // true
0x004 逻辑操作符
boolean boolean1 = false;
boolean boolean2 = true;
System.out.println(boolean1 && boolean2); // false
System.out.println(boolean1 || boolean2); // true
System.out.println(!boolean1); // true
0x005 直接操作符
int i1 = 0x2f;
int i2 = 0x2F;
int i3 = 0177;
char c1 = 0xffff;
byte b1 = 0x7f;
short s1 = 0x7f;
long l1 = 100L;
long l2 = 100l;
float f1 = 1;
float f2 = 1f;
float f3 = 1F;
double d1 = 1d;
double d2 = 1D;
System.out.println(i1); // 47
System.out.println(i2); //47
System.out.println(i3); // 127
System.out.println(c1); //
System.out.println(b1); // 127
System.out.println(s1); // 127
System.out.println(l1); // 100
System.out.println(l2); // 100
System.out.println(f1); // 1.0
System.out.println(f2); // 1.0
System.out.println(f3); // 1.0
System.out.println(d1); // 1.0
System.out.println(d2); // 1.0
0x006 三元运算符
int a = 0;
boolean isSuccess = false;
a = isSuccess ? 1 : 2;
System.out.println(a);// 2
0x007 字符串+、+=
String str = "";
str = str + "1";
str += "2";
System.out.println(str);
0x008 类型转化
int i = 100;
long long1 = (long) i;
System.out.println(long1);// 100
long1 = i;
System.out.println(long1);// 100
long long2 = (long) 200;
System.out.println(long2);// 200
i = (int) long1;
System.out.println(i); // 200
float float1=0.1f;
float float2=0.9f;
System.out.println((int) float1);// 转化int会被舍去
System.out.println((int) float2);// 转化int会被舍去