如何在Robocode上的java中解决"the Syntax error，static imports are available java level is is 1.5或更高“

Question

我试图在机器人代码上编译机器人，但它说“静态导入只有在源代码级别为1.5或更高时才可用”。

我不明白这是什么意思。我在其他论坛上看到可以更新Java，但我的电脑上已经安装了最新的Java。我能做什么?

这是我试图编译的代码：

package blir.dev; 

import robocode.*;

import java.awt.Color;

import static robocode.util.Utils.*; 

/** 
* Blixi - a robot by Travis Bruce 
*/
public class Keen_Stalker extends AdvancedRobot { 

//the direction we're moving 
private int dir = 1; 
//are we close to a wall? : are we close to a robot?
private boolean wall = false, rbt = false; 
//enemy's energy 
private double en = 100D; 

/** 
 * run: Blixi's default behavior 
 */
public void run() { 
    setColors(Color.BLACK, Color.DARK_GRAY, Color.DARK_GRAY); 
    setAdjustRadarForRobotTurn(true); 
    setAdjustGunForRobotTurn(true); 
    setAdjustRadarForGunTurn(true); 
    //if (bshot1 != 0) out.println("Main Gun Accuracy: " + (double) bhit1 / bshot1);
    for (;;) { 
        if (getRadarTurnRemaining() == 0) { 
            //should only happen if we lose track of them, which should never happen 
            setTurnRadarRight(Double.POSITIVE_INFINITY); 
        } 
        //check if we're too close to the wall (50 pixels) 
        wall = cw(50, true); 
        execute(); 
    } 
} 

/** 
 * onScannedRobot: What to do when you see another robot 
 */
public void onScannedRobot(ScannedRobotEvent e) { 

    //check if we're too close to the other robot (150 pixels) 
    rbt = d(e.getDistance()); 

    //absolute bearing
    double absBear = getHeadingRadians() + e.getBearingRadians(); 

    //track them with our radar 
    double radarTurn = normalRelativeAngle(absBear - getRadarHeadingRadians()); 
    radarTurn += (radarTurn < 0 ? -1 : 1) * Math.atan(36.0 / e.getDistance()); 
    setTurnRadarRightRadians(radarTurn); 

    //fire power the enemy used
    double enemyPower = en - e.getEnergy();

    if (enemyPower <= 3 && enemyPower > 0 && !cw(75, false)) { 
        //they seem to have fired
        cd(); 
    } 

    //record new energy 
    en = e.getEnergy(); 

    //circle around them if we're close enough, move away if we're too close
    setTurnRightRadians(normalRelativeAngle(e.getBearingRadians() + Math.PI / 2D)); 

    setTurnGunRightRadians(normalRelativeAngle(absBear - getGunHeadingRadians() -
            Math.asin(e.getVelocity() * Math.sin(Math.PI - absBear + e.getHeadingRadians()) / Rules.getBulletSpeed(Rules.MAX_BULLET_POWER)))); 

    //fire! 
    setFire(Rules.MAX_BULLET_POWER); 

    //all power ahead! 
    setAhead(dir * 32);
} 

public void onHitWall(HitWallEvent e) { 
    //out.println("Ahh! A wall!"); 
    cd(); 
}  

private boolean d(double d) { 
    if (d < 150) { 
        //we're close to the robot (within 150 pixels) 
        if (!rbt) { 
            //we're not already escaping the robot, so let's change direction 
            cd(); 
        } 
        return true; 
    } 
    return false; 
} 

private boolean cw(int d, boolean cw) { 
    if (getX() < d || getY() < d || getBattleFieldWidth() - getX() < d || getBattleFieldHeight() - getY() < d) { 
        //we're close to the wall 
        if (!wall && cw) { 
            //we're not already escaping the wall, so let's change direction 
            cd(); 
        } 
        return true; 
    } 
    return false; 
} 

private void cd() { 
    dir = -dir; 
}                                                                                          

Answer 1

一个快速的解决办法是删除import static robocode.util.Utils.* (构造导入静态是在Java1.5中引入的，请参阅此处：https://docs.oracle.com/javase/1.5.0/docs/guide/language/static-import.html)，并使用Utils.normalRelativeAngle等。

一个合适的修复方法是找出为什么将源代码级别设置为小于1.5的原因

Answer 2

我不确定你是否检查了其他答案，但请检查下面的链接。

eclipse magic: ... Syntax error, varargs are only available if source level is 1.5 or greater

有很多你可以尝试的东西。

希望这能有所帮助。

Answer 3

在Robocode编译器选项中添加以下注释：-source 1.5

->Compiler选项[-deprecation -g -source 1.5 -encoding UTF-8]