java笔记学习之操作符_Java教程

java笔记学习之操作符

2021-04-24 11:55followWinter Java教程

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

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									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