a b在java中的意思是什么意思_java中”a=”+a “b=”+b是什么意思?

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1、在JAVA程序中由String和“+”参与的运算变量都会被转为字符类型，可以理解为先把32313133353236313431303231363533e4b893e5b19e31333335313237变量转为字符型然后在进行字符拼接。

public class Test {

public static void main(String[] args){

int intnum = 9;

long longnum = 10L;

short shortnum = 11;

byte bytenum = 12;

float floatnum = 13F;

double doublenum = 14;

char charstr = 56; //ASCII码对应8

String str = “Zhu Cheng feng is a good boy!”;

boolean booleanstr = true;

System.out.println(“intnum is “+intnum);

System.out.println(“longnum is “+longnum);

System.out.println(“shortnum is “+shortnum);

System.out.println(“bytenum is “+bytenum);

System.out.println(“floatnum is “+floatnum);

System.out.println(“doublenum is “+doublenum);

System.out.println(“charstr is “+charstr);

System.out.println(“str is “+str);

System.out.println(“booleanstr is “+booleanstr);

}

}

2、多个变量参与运算时JAVA程序每行的执行顺序是从左到右

public class Test {

public static void main(String[] args){

int intnum = 9;

long longnum = 10L;

System.out.println(intnum+longnum+” is the result!”);

}

}