public static String characterString(CharacterData node){
StringBuilder builder = new StringBuilder(node.getData());
for(int i = 0; i < builder.length(); i++){
if(builder.charAt(i) == '\r'){
builder.replace(i,i+1,"\r");
i++;
}
else if(builder.charAt(i) == '\n'){
builder.replace(i,i+1,"\\n");
i++;
}
else if(builder.charAt(i) == '\t'){
builder.replace(i,i+1,"\\t");
i++;
}
}
if(node instanceof CDATASection) builder.insert(0,"CDATASection:");
else if(node instanceof Text) builder.insert(0,"Text:");
else if(node instanceof Comment) builder.insert(0,"Comment:");
return builder.toString();
}
if(builder.charAt(i) == '\r'){
builder.replace(i,i+1,"\r");
i++;
}
replace 这个函数怎么解释,在这个应用中,谢谢,