JAVA学习(6)-全网最详细~

用户10920432

发布于 2024-01-18 17:31:02

940

发布于 2024-01-18 17:31:02

算数运算符 ⭐

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
		System.out.println(5/2);
		System.out.println(5.0/2);
		System.out.println((float)5/2);
		System.out.println((float)(5/2));

	}

}

控制台运行结果:

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
		System.out.println(10%3);
		System.out.println(-10%3);
		System.out.println(10%-3);
		System.out.println(-10%-3);
	}
}

JAVA中的异常

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
//		System.out.println(10%3);
//		System.out.println(-10%3);
//		System.out.println(10%-3);
//		System.out.println(-10%-3);
		System.out.println(5/0);
	}
}

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
//		System.out.println(10%3);
//		System.out.println(-10%3);
//		System.out.println(10%-3);
//		System.out.println(-10%-3);
//		System.out.println(5/0);
		
		int a = 10;
		int b = ++a; //a 先++ 后赋值
		System.out.println(b);// a = 11 , b = 11
		int c = a ++; //a 先赋值,后++
		System.out.println(c);// c = 11 , a = 12 
	}
}

比较运算符⛅

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
		int a = 10;
		int b = 20;
		System.out.println(a == b);
		System.out.println(a != b);
		System.out.println(a < b);
		System.out.println(a > b);
		System.out.println(a >= b);
		System.out.println(a <= b);
	}

逻辑运算符 🌈

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
		//逻辑与 &&
		int a = 10;
		int b = 20;
    	int c = 30;
//		System.out.println(a < b && b < c);
		
		//逻辑或 ||
		int d = 10;
		int e = 20;
		int f = 30;
		System.out.println(d < e || e < f); 
	}

表达式1 && 表达式2 必须保证两个表达式都为真,整体才是真表达式1 || 表达式2 只有一个表达式为真,那么整体就是真

!:非,后面只能跟布尔类型的数据

package study;

/**
 * 
 */
public class TestDemo {
	public static void main(String[] args) {
		//逻辑与 &&
		int a = 10;
		int b = 20;
//		System.out.println(!a < b);
		boolean flg = true;
		System.out.println(!flg);    
    }
}