【Java】演算子の優先順位と基本データ型の型変換

package test;

public class sample {

	public static void main(String[] args) {
		// 使用する変数の定義
		int a = 8, b = 2; // 変数の宣言

		// 普通の演算による計算と代入
		System.out.println("a + b = " + (a + b));
		System.out.println("a - b = " + (a - b));
		System.out.println("a * b = " + (a * b));
		System.out.println("a / b = " + (a / b));
		System.out.println("a % b = " + (a % b));
		System.out.println("a >= b = " + (a >= b));
		System.out.println("(a >= 0) && (b >= 3):" + ((a >= 0) && (b >= 3)));
		System.out.println("(a >= 0) || (b >= 3):" + ((a >= 0) || (b >= 3)));
		// 代入演算による計算
		System.out.println("代入演算による計算");
		System.out.println("a += b = " + (a += b));
		System.out.println("a -= b = " + (a -= b));
		System.out.println("a *= b = " + (a *= b));
		System.out.println("a /= b = " + (a /= b));
		System.out.println("a %= b = " + (a %= b));
	}
}

a + b = 10
a - b = 6
a * b = 16
a / b = 4
a % b = 0
a >= b = true
(a >= 0) && (b >= 3):false
(a >= 0) || (b >= 3):true
代入演算による計算
a += b = 10
a -= b = 8
a *= b = 16
a /= b = 8
a %= b = 0

package test;
 
public class Sample {
 
   public static void main(String[] args){
	    int price = Integer.parseInt(args[0]);
	    float rate = 0.08f;         // 消費税率：8%
	    long amount;

	    amount = (long)(price * (1 + rate));
	    System.out.println("税込金額：" + amount + "円");
	  }
}

税込金額：2138円