java如何截取字符串中的数字并计算？
void calcNetIncome(String str){int num = 0;
String temp = "";
for (int i = 0; i < str.length(); i++) {
if(str.charAt(i)=='-'||(str.charAt(i)>='0'&&str.charAt(i)<='9')){
while(i < str.length()){
temp+=str.charAt(i);
if(i+1 < str.length()&&(!(str.charAt(i+1)>='0'&&str.charAt(i+1)<='9'))){
break;
}
i++;
}
num+=Integer.parseInt(temp);
temp = "";
}
}
System.out.println(num);
}
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