【学习】变量类型转换

一、代码

public class LetterTrans {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		char letter='B';
		System.out.println((char)(letter+32));
		//一种转为另一种变量类型
		//小转大一般都能通过，一般都是隐式转换,不必加左侧括号和变量类型
		int intnum;
		byte bytnum=126;
		intnum=bytnum;
		System.out.println(intnum);
		//大转小有条件通过
		intnum=127;
		bytnum=(byte)intnum;
		System.out.println(bytnum);
		intnum=130;
		bytnum=(byte)intnum;
		System.out.println(bytnum);
		
	
		

	}

}

二、结果

"C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.3\jbr\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=41051:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath D:\sxxh\qnxd\DRlianxi\out\production\DRlianxi DR6.LetterTrans
b
126
127
-126

Process finished with exit code 0