java - 将字符串数组值与 JavaFX 组合框值进行比较，计算结果不为 true

Question

我有一个循环来检查数组中的值并将它们与组合框中的值进行比较。由于某种原因，即使它们匹配，比较的结果也不会为 true。

这是循环，添加了系统输出以进行故障排除:

System.out.println("Race Changed, setting new attribute min/maxes");
                int raceIndex = -1;

                for (int i=0;i<5;i++){
                    System.out.println("RaceCheck index i="
                                      + Integer.toString(i)
                                      + " raceIndex="
                                      + Integer.toString(raceIndex)
                                      + " miscData.raceData[i].raceName="
                                      + miscData.raceData[i].raceName 
                                      + " cboRace.getValue()=" 
                                      + cboRace.getValue()
                                      + " match found="
                                      + (miscData.raceData[i].raceName == cboRace.getValue()));
                    System.out.println("|"+miscData.raceData[i].raceName+"|");
                    System.out.println("|"+cboRace.getValue()+"|");
                    if (miscData.raceData[i].raceName == cboRace.getValue()) {
                        raceIndex = i;
                    }       
                }

                if (raceIndex < 0) {
                    // race was not found, default to Human
                    System.out.println("Race " + cboRace.getValue() + " was not found in racedata");
                    raceIndex = 0;
                }

这是输出:

Race Changed, setting new attribute min/maxes
RaceCheck index i=0 raceIndex=-1 miscData.raceData[i].raceName=Human cboRace.getValue()=Dwarf match found=false
|Human|
|Dwarf|
RaceCheck index i=1 raceIndex=-1 miscData.raceData[i].raceName=Elf cboRace.getValue()=Dwarf match found=false
|Elf|
|Dwarf|
RaceCheck index i=2 raceIndex=-1 miscData.raceData[i].raceName=Dwarf cboRace.getValue()=Dwarf match found=false
|Dwarf|
|Dwarf|
RaceCheck index i=3 raceIndex=-1 miscData.raceData[i].raceName=Ork cboRace.getValue()=Dwarf match found=false
|Ork|
|Dwarf|
RaceCheck index i=4 raceIndex=-1 miscData.raceData[i].raceName=Troll cboRace.getValue()=Dwarf match found=false
|Troll|
|Dwarf|
Race Dwarf was not found in racedata

我正在使用 Java 7 Update 40，组合框使用 JavaFX。在比较它们时如何使匹配值评估为 true？

Answer 1

在 Java 中(JavaFX 中也是如此)对象应该与 .equals() 方法而不是 == 运算符进行比较。 == 运算符通过引用来比较对象，实际上是通过它们的内存地址来比较。由于 String 也是对象，因此使用

if (miscData.raceData[i].raceName.equals(cboRace.getValue())) {
    raceIndex = i;
}

引用Java string comparison .