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public class TestConvert {

public static void main(String arg[]) {

int i1 = 123;

int i2 = 456;

double d1 = (i1+i2)*1.2;//系统将转换为double型运算

float f1 = (float)((i1+i2)*1.2);//需要加强制转换符

byte b1 = 67;

byte b2 = 89;

byte b3 = (byte)(b1+b2);//系统将转换为int型运算，需

//要强制转换符

System.out.println(b3);

double d2 = 1e200;

float f2 = (float)d2;//会产生溢出

System.out.println(f2);

float f3 = 1.23f;//必须加f

long l1 = 123;

long l2 = 30000000000L;//必须加l

float f = l1+l2+f3;//系统将转换为float型计算

long l = (long)f;//强制转换会舍去小数部分（不是四舍五入）

}

}