在Java中可以通过使用四则运算符来实现加、减、乘、除操作。以下是一些示例代码：
int a = 5;
int b = 3;
int sum = a + b;
System.out.println("Sum: " + sum);
int a = 5;
int b = 3;
int difference = a - b;
System.out.println("Difference: " + difference);
int a = 5;
int b = 3;
int product = a * b;
System.out.println("Product: " + product);
int a = 6;
int b = 3;
int quotient = a / b;
System.out.println("Quotient: " + quotient);
需要注意的是，在进行除法操作时，要确保被除数和除数都是整数类型，否则会导致结果不准确。如果需要进行浮点数的除法操作，可以将被除数或除数改为浮点型，例如：
double a = 6.0;
int b = 3;
double quotient = a / b;
System.out.println("Quotient: " + quotient);
