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java笔记学习之操作符

2023-09-13 12:30:05 80

0x001算数运算符

intnum1=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((num1num2));//false
System.out.println(num1==num2);//false
System.out.println(num1!=num2);//true

0x004逻辑操作符

booleanboolean1=false;
booleanboolean2=true;
System.out.println(boolean1&&boolean2);//false
System.out.println(boolean1||boolean2);//true
System.out.println(!boolean1);//true

0x005直接操作符

inti1=0x2f;
inti2=0x2F;
inti3=0177;
charc1=0xffff;
byteb1=0x7f;
shorts1=0x7f;
longl1=100L;
longl2=100l;
floatf1=1;
floatf2=1f;
floatf3=1F;
doubled1=1d;
doubled2=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

inta=0;
booleanisSuccess=false;
a=isSuccess?1:2;
System.out.println(a);//2

0x007字符串+、+=

Stringstr="";
str=str+"1";
str+="2";
System.out.println(str);

0x008类型转化

inti=100;
longlong1=(long)i;
System.out.println(long1);//100
long1=i;
System.out.println(long1);//100
longlong2=(long)200;
System.out.println(long2);//200
i=(int)long1;
System.out.println(i);//200

floatfloat1=0.1f;
floatfloat2=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

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java笔记学习之操作符

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