编写一个JAVA简单的程序!

发布网友发布时间：2023-11-07 08:59

共3个回答

热心网友时间：2023-12-20 22:57

public static void main(String[] args){
String firstString="This is";
String secondString="This is";

if(firstString==null && secondString==null){
System.out.println("①firstString 与 secondString 相等");
}else if(firstString!=null && firstString.equals(secondString)){
System.out.println("①firstString 与 secondString 相等");
}else{
System.out.println("①firstString 与 secondString 不相等");
}

String str = firstString + "his father";
System.out.println("②"+str);

System.out.println("③"+str.replaceAll("i", "z"));
}

热心网友时间：2023-12-20 22:58

if (firstString.equals(secondString))
{
//相等
}

firstString +="his father"

secondString = secondString.replace('i','z')

热心网友时间：2023-12-20 22:58

String firstString="This is";
String secondString="This is";
if(firstString.equals(secondString)){
System.out.println("相等");
}else{
System.out.println("不等");
}

System.out.println(firstString.concat(" his father"));
System.out.println(firstString.replace("i","z"));
}