0x001 算數運算符
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 自增自減
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 關係操作符
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 邏輯操作符
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 三元運算符
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 類型轉化
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);// 轉化int會被捨去System.out.println((int) float2);// 轉化int會被捨去